PortoFarina
App can only import and export CSV from and to the cloud. The default downloads folder if accessible can be used for reading CSV.
On Android 11, app no longer stores the databases in the ProtoDB folder. Instead, the databases are saved in the non accessible internal storage which may be under: Android\data\com.portofarina.portodb\files\PortoDB
Uninstalling the app, will delete all the databases and the local backups. So ensure to backup the databases to the cloud.
Available on Google Play Store for Android