That’s odd. Both options open the share menu for me and then paste the image right into the app I’ve chosen to share with (say WhatsApp)… so, yeah, seems to be a Firefox thing indeed.

You can also use the 3-dots-menu by the post to get that option.

I’m using the PWA on android (with Vivaldi browser) and I just long-press the image and get the share image option… so, I don’t know why it doesn’t work for you.

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I have the same issue with Voyager on Android. Starts normally, briefly shows the UI but then everything disappears and I am left with a white screen.

Also already re-installed. Doesn’t change anything.