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This is so far the only time that the image is shown on Hubzilla.
Haha I was using the API incorrectly. I was pushing the image in form.custom_thumbnail while form.url was empty. Apparently, u can't do that.
If u have an image only post, then u have to put the image uri in form.url. the custom_thumbnail is only there if you already have some other link.
Lemmy's documentation is really lacking. Unfortunately, contributing to it is a little complicated too (for lemmy-js-client), that is