I tried to find the reason for my problem and here is a somewhat strange fix to the issue. It was indeed something to do with android support but there were some other unidentified issues lying on the bottom:
- Take a screenshot
- Check that I can see it in the gallery under the screenshot folder
- Try to share it with Whatsapp → FAILURE, picture is not shown
- Reboot the phone and I can now see the image with Whatsapp
- Take a new screenshot and repeat the process → SUCESS !!
- Take another new screenshot and repeat the process → FAILURE again, I can see the previous shot but the new one is missing.
- Try the steps 4 - 6 again and the same thing happened; I can see the 1st taken screenshot after the reboot but not the later ones.
- Try to restart the android support → FAILURE, my phone claims it is not installed (=cannot locate it from the settings) at all desipite the fact that I have many android apps installed and I can install more of them without problems
- Go to the jolla store and verify that I do not have android support installed
- Install android support
- Take a screenshot again and repeat the process → FAILURE, the new image is not shown
- Restart android support and repeat the process → SUCCESS!!
- Try again → SUCCESS!!