refactor(ReceiveExternalFilesActivity): modernize and harden intent parsing for file uploads#16266

joshtrichards wants to merge 4 commits intomasternextcloud/android:masterfrom

jtr/refactor-ReceiveExternalFilesActivity-StreamsToUploadnextcloud/android:jtr/refactor-ReceiveExternalFilesActivity-StreamsToUploadCopy head branch name to clipboard