[RNMobile] Prevent error message from unneccesarily firing when uploa…

…ding to Gallery block (#46175)

This PR ensures that any valid image uploaded to the Gallery block within the mobile apps is correctly marked as valid.

packages/block-library/src/gallery/edit.js

@@ -217,9 +217,19 @@ function GalleryEdit( props ) {
 	}
 
 	function isValidFileType( file ) {
+		// It's necessary to retrieve the media type from the raw image data for already-uploaded images on native.
+		const nativeFileData =
+			Platform.isNative && file.id
+				? find( imageData, { id: file.id } )
+				: null;
+
+		const mediaTypeSelector = nativeFileData
+			? nativeFileData?.media_type
+			: file.type;
+
 		return (
 			ALLOWED_MEDIA_TYPES.some(
-				( mediaType ) => file.type?.indexOf( mediaType ) === 0
+				( mediaType ) => mediaTypeSelector?.indexOf( mediaType ) === 0
 			) || file.url?.indexOf( 'blob:' ) === 0
 		);
 	}

packages/react-native-editor/CHANGELOG.md

@@ -10,6 +10,7 @@ For each user feature we should also add a importance categorization label  to i
 -->
 
 ## Unreleased
+-   [**] Prevent error message from unneccesarily firing when uploading to Gallery block [#46175]
 
 ## 1.85.0
 -   [*] [iOS] Fixed iOS Voice Control support within Image block captions. [#44850]