If a device is not compatible with the secure biometric system, the option will not be displayed - this is normal. The Autofill is only available since Android 8.0. Some forms are done on two screens, which is not yet handled by the algorithm https://github.com/Kunzisoft/KeePassDX/wiki/AutoFill#why-is-the-auto-fill-not-available-for-android-device
This is a known problem with the Google drive application, which breaks the link between the file in its cache and KeePassDX. https://github.com/Kunzisoft/KeePassDX/wiki/File-Manager-and-Sync#file-access-revocation
Indeed, some Cloud applications do not handle file conflicts correctly and prevent saving, can you indicate which Cloud application causes this behavior in order to add it to the wiki? https://github.com/Kunzisoft/KeePassDX/wiki/File-Manager-and-Sync#file-manager-application