Apps can send additional text along with the image
Right now, the app removes these and only shares the image
Example: https://github.com/tachiyomiorg/tachiyomi/blob/98fc028d39a4d4830402b7f5565016cba8a3cf38/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt#L749
There was an attempt at 43a77fe but sadly that doesn't seem to have worked