We trying to do not store your encryption phrase anywhere, so when session is refreshed, it clears the memory too.
If your files are big, maybe better to use a FileZilla: FileZilla Native Integration - Storj DCS or rclone: Sync Files With Rclone - Storj DCS
If you would try a FileZilla, please take a 3.51.0 or 3.51.1 versions.