flatpak apps are isolated by nature, so it won't be able to access every folder like normal apps, including mario multiverse one, so we need to make a folder for MM and allow bottles to access it
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make a directory for MM, let's create a one in documents folder and call it MM for example
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open flatseal, navigate to bottles, scroll down to filesystem section, in (other files) click on the plus icon and enter the MM path and
xdg-data/applications
to be able to add desktop entries
you can get the path by right clicking on MM folder and finding the info section or something similar, if the path doesn't include the MM folder name, you have to include it yourself (don't forgot to add a / if it doesn't exist at the end of previous directory) or you can input the directory manually
- close flatseal for now, and restart bottles
- to make accessing the folder easier in bottles, go to the bottle you made > settings, scroll down until you find (manage drives), open it and add a drive and paste the path there (don't forgot what did i say above)