I wonder if this restriction applied only to Airdropped files, or to any custom file types? I noticed that my app's custom file type wouldn't open in the app automatically by the click on it in Files app even if I moved that file to the Files app manually, not via Airdrop. Though other file types (eq. .epub, .fb2) continue to open in their corresponding apps. Do I need to provide some additional setup to custom file type? Now I have the same custom type registered in both DocumentTypes and Exported Type Identifiers on my target's Info tab, and it opened in the app before iOS 17.

Same issue. Experimented with CFBundleDocumentTypes, UTExportedTypeDeclarations, UTImportedTypeDeclarations, UIFileSharingEnabled, LSSupportsOpeningDocumentsInPlace with no success. Seems to be a bug in iOS 17, and it still persists in Beta 17.1 (21B5045h).