You need to give Nicotine's flatpak permission to access what you want to share. You can do this easily with Flatseal (another flatpak), select Nicotine+, scroll down and with one tick you can give access to "All user files" (= your /home), or you can add a specific directory if you prefer.
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Latest arch repo release works for me.
Easiest next step would be to try the .deb package.
I don't use any flatpaks, so I'm not familiar with their potentil quirks.
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