#pt #Mastodon works only when using the 'More...' button, but you can add a Custom service very easily. For me it was like this:
+: Download somewhere the Mastodon icon (see attached image) and upload it.
Name: Todon.nl
URI scheme:
https://todon.nl/share?text=*${title}*%0A%0A${link}
And click on Save.
Remember to change your URI schema to something like this:
https://YOUR_INSTANCE/share?text=${title} ${link}