Examples for sharing api

doubt that.
i can not really help you: the configuration of share-action to do what it should is really an trial an error.
but your mail accounts will not prevent whatsup sharing from funtioning.
it will be somewhere in the mimeType and resource combination.
best is to check an app where it works …
share to yottagram wroks from gallery, maybe you can take a look there

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Partly off topic, but perhaps relevant to that problem:
It doesn’t have sharing built in, but at least copying message texts (also from multiple messages) should be working in Fernschreiber since November 2020.

cheers