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"4. If it's not the case - set it yourself via the menu. After changing permissions click on the gear icon and choose the "Apply to enclosed items" option from the drop-down menu."

I think the main problem is here. I can't find apply to enclosed items, the setting just seems to save itself as read and write.

Check for similar options. In different versions, it may be there under a different name. Plus, the problem is that Yorna can’t make a save files inside the ”save” folder. So, in theory, you should try to change write permissions for it and this should work.