Self-Signed SSL Certificate. OK on desktop but not Android

Hi again.

Now I have Joplin 1.0.333 installed and it still does not work.

I have no problems using “FolderSync Pro” which have a setting to “Trust self-signed certificates”, and I have no problem using DAVx5 which just asked me if I waned to trust my self-signed certificate which is on the phone.
I also installed the OwnCloud client which also works without problems (As I remember I just had to trust the self-signed certificate).

I am using Android version 10 on a “OnePlus 7T” but I don’t think that’s the problem?

The Joplin app does not have an option to trust self-signed certificates. Is that the reason for my problem?
Is it something that can be implemented?

Maybe roman_r_m have a point? (I am not a programmer anymore…)

Regards
Henrik