Joplin-Folder on Android phones

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This is no version-related question. Anyway:
Android phone running e/OS 1.14-20230816320942 Joplin 2.12.2
Android phone runnung an outdated Android 10, Joplin 2.12.1
Linux Mint 21.2 Joplin latest version

All of this works well with Dropbox -Synch.

Question: is it possible to configure the memory (in this case an SD-card where the Joplin-Synch Folder is placed on an Android phone? In my hands it ist always in the main memory.
Best regards
Bernd