Problem with OpenCamera

With XA2 I used to use the android app OpenCamera. Now on my Sony 10 III OpenCamera complains that it cannot save a picture to memory. In android settings I cannot find a possibility to give the permission for saving. and settings in OpenCamera behave peculiar.
Is there a solution?
(4.4.0.64/68, OpenCamera 1.50 or 1.49)
Best regards, Uwe.

Possibly duplicate Android environment programs cannot create any files on external storage (SD Card) and others.

Thank you very much for this link.
(In the meantime I had given up to save an OpenCamera picture to SD; I’m using the internal memory.)
Best regards, Uwe.