diff --git a/app/src/main/java/ua/acclorite/book_story/data/parser/epub/EpubFileParser.kt b/app/src/main/java/ua/acclorite/book_story/data/parser/epub/EpubFileParser.kt
index 10471853..dd71ef30 100644
--- a/app/src/main/java/ua/acclorite/book_story/data/parser/epub/EpubFileParser.kt
+++ b/app/src/main/java/ua/acclorite/book_story/data/parser/epub/EpubFileParser.kt
@@ -16,7 +16,7 @@ import javax.inject.Inject
 class EpubFileParser @Inject constructor() : FileParser {
 
     override suspend fun parse(file: File): Pair<Book, CoverImage?>? {
-        if (!file.name.endsWith(".epub") || !file.exists()) {
+        if (!file.name.endsWith(".epub", true) || !file.exists()) {
             return null
         }
 
diff --git a/app/src/main/java/ua/acclorite/book_story/data/parser/epub/EpubTextParser.kt b/app/src/main/java/ua/acclorite/book_story/data/parser/epub/EpubTextParser.kt
index cff97c0b..3930ddd4 100644
--- a/app/src/main/java/ua/acclorite/book_story/data/parser/epub/EpubTextParser.kt
+++ b/app/src/main/java/ua/acclorite/book_story/data/parser/epub/EpubTextParser.kt
@@ -21,7 +21,7 @@ import javax.inject.Inject
 class EpubTextParser @Inject constructor() : TextParser {
 
     override suspend fun parse(file: File): Resource<List<String>> {
-        if (!file.name.endsWith(".epub") || !file.exists()) {
+        if (!file.name.endsWith(".epub", true) || !file.exists()) {
             return Resource.Error(UIText.StringResource(R.string.error_wrong_file_format))
         }
 
diff --git a/app/src/main/java/ua/acclorite/book_story/data/parser/fb2/Fb2FileParser.kt b/app/src/main/java/ua/acclorite/book_story/data/parser/fb2/Fb2FileParser.kt
index c7441d46..ee382b80 100644
--- a/app/src/main/java/ua/acclorite/book_story/data/parser/fb2/Fb2FileParser.kt
+++ b/app/src/main/java/ua/acclorite/book_story/data/parser/fb2/Fb2FileParser.kt
@@ -17,7 +17,7 @@ import javax.xml.parsers.DocumentBuilderFactory
 class Fb2FileParser @Inject constructor() : FileParser {
 
     override suspend fun parse(file: File): Pair<Book, CoverImage?>? {
-        if (!file.name.endsWith(".fb2") || !file.exists()) {
+        if (!file.name.endsWith(".fb2", true) || !file.exists()) {
             return null
         }
 
diff --git a/app/src/main/java/ua/acclorite/book_story/data/parser/fb2/Fb2TextParser.kt b/app/src/main/java/ua/acclorite/book_story/data/parser/fb2/Fb2TextParser.kt
index 60694cc8..4ddb1f30 100644
--- a/app/src/main/java/ua/acclorite/book_story/data/parser/fb2/Fb2TextParser.kt
+++ b/app/src/main/java/ua/acclorite/book_story/data/parser/fb2/Fb2TextParser.kt
@@ -15,7 +15,7 @@ import javax.xml.parsers.DocumentBuilderFactory
 class Fb2TextParser @Inject constructor() : TextParser {
 
     override suspend fun parse(file: File): Resource<List<String>> {
-        if (!file.name.endsWith(".fb2") || !file.exists()) {
+        if (!file.name.endsWith(".fb2", true) || !file.exists()) {
             return Resource.Error(UIText.StringResource(R.string.error_wrong_file_format))
         }
 
diff --git a/app/src/main/java/ua/acclorite/book_story/data/parser/pdf/PdfFileParser.kt b/app/src/main/java/ua/acclorite/book_story/data/parser/pdf/PdfFileParser.kt
index 5901cea4..550190c2 100644
--- a/app/src/main/java/ua/acclorite/book_story/data/parser/pdf/PdfFileParser.kt
+++ b/app/src/main/java/ua/acclorite/book_story/data/parser/pdf/PdfFileParser.kt
@@ -15,7 +15,7 @@ import javax.inject.Inject
 class PdfFileParser @Inject constructor(private val application: Application) : FileParser {
 
     override suspend fun parse(file: File): Pair<Book, CoverImage?>? {
-        if (!file.name.endsWith(".pdf") || !file.exists()) {
+        if (!file.name.endsWith(".pdf", true) || !file.exists()) {
             return null
         }
 
diff --git a/app/src/main/java/ua/acclorite/book_story/data/parser/pdf/PdfTextParser.kt b/app/src/main/java/ua/acclorite/book_story/data/parser/pdf/PdfTextParser.kt
index 4bcb33fe..7afbb35d 100644
--- a/app/src/main/java/ua/acclorite/book_story/data/parser/pdf/PdfTextParser.kt
+++ b/app/src/main/java/ua/acclorite/book_story/data/parser/pdf/PdfTextParser.kt
@@ -14,7 +14,7 @@ import javax.inject.Inject
 class PdfTextParser @Inject constructor(private val application: Application) : TextParser {
 
     override suspend fun parse(file: File): Resource<List<String>> {
-        if (!file.name.endsWith(".pdf") || !file.exists()) {
+        if (!file.name.endsWith(".pdf", true) || !file.exists()) {
             return Resource.Error(UIText.StringResource(R.string.error_wrong_file_format))
         }
 
diff --git a/app/src/main/java/ua/acclorite/book_story/data/parser/txt/TxtFileParser.kt b/app/src/main/java/ua/acclorite/book_story/data/parser/txt/TxtFileParser.kt
index c865a466..131369fc 100644
--- a/app/src/main/java/ua/acclorite/book_story/data/parser/txt/TxtFileParser.kt
+++ b/app/src/main/java/ua/acclorite/book_story/data/parser/txt/TxtFileParser.kt
@@ -12,7 +12,7 @@ import javax.inject.Inject
 class TxtFileParser @Inject constructor() : FileParser {
 
     override suspend fun parse(file: File): Pair<Book, CoverImage?>? {
-        if (!file.name.endsWith(".txt") || !file.exists()) {
+        if (!file.name.endsWith(".txt", true) || !file.exists()) {
             return null
         }
 
diff --git a/app/src/main/java/ua/acclorite/book_story/data/parser/txt/TxtTextParser.kt b/app/src/main/java/ua/acclorite/book_story/data/parser/txt/TxtTextParser.kt
index 4a42beac..6fb2e617 100644
--- a/app/src/main/java/ua/acclorite/book_story/data/parser/txt/TxtTextParser.kt
+++ b/app/src/main/java/ua/acclorite/book_story/data/parser/txt/TxtTextParser.kt
@@ -14,7 +14,7 @@ import javax.inject.Inject
 class TxtTextParser @Inject constructor() : TextParser {
 
     override suspend fun parse(file: File): Resource<List<String>> {
-        if (!file.name.endsWith(".txt") || !file.exists()) {
+        if (!file.name.endsWith(".txt", true) || !file.exists()) {
             return Resource.Error(UIText.StringResource(R.string.error_wrong_file_format))
         }
 
diff --git a/app/src/main/java/ua/acclorite/book_story/data/repository/BookRepositoryImpl.kt b/app/src/main/java/ua/acclorite/book_story/data/repository/BookRepositoryImpl.kt
index 0d21a0f0..f2b98e6d 100644
--- a/app/src/main/java/ua/acclorite/book_story/data/repository/BookRepositoryImpl.kt
+++ b/app/src/main/java/ua/acclorite/book_story/data/repository/BookRepositoryImpl.kt
@@ -499,8 +499,8 @@ class BookRepositoryImpl @Inject constructor(
                 }
 
                 val isFileNotAdded = existingBooks.all {
-                    it.filePath.substringAfterLast("/") !=
-                            file.path.substringAfterLast("/")
+                    it.filePath.substringAfterLast("/").lowercase() !=
+                            file.path.substringAfterLast("/").lowercase()
                 }
 
                 if (!isFileNotAdded) {
@@ -537,7 +537,7 @@ class BookRepositoryImpl @Inject constructor(
         val books = mutableListOf<NullableBook>()
 
         for (file in files) {
-            val parsedBook = if (Constants.EXTENSIONS.any { file.name.endsWith(it) }) {
+            val parsedBook = if (Constants.EXTENSIONS.any { file.name.endsWith(it, true) }) {
                 fileParser.parse(file)
             } else {
                 books.add(
@@ -549,7 +549,7 @@ class BookRepositoryImpl @Inject constructor(
                 continue
             }
 
-            val parsedText = if (Constants.EXTENSIONS.any { file.name.endsWith(it) }) {
+            val parsedText = if (Constants.EXTENSIONS.any { file.name.endsWith(it, true) }) {
                 textParser.parse(file)
             } else {
                 books.add(