Click on the picture in messenger to view it full screen, from the full screen do a right click and you'll see an option to copy image, once copied paste here. Easy Peasy!
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So here's one more test. Flickr. I can access this from both my phone as an app, and by logging in from my pc. So I uploaded a photo by opening Flickr on my phone, it was able to see my photo gallery easily. I started this post. I went to Flickr on my pc and logged in. I selected the photo, it gave me the right click option to copy location. Pasted that here. ... it just gives me the link, not the actual photo. It also apparently gives people access tomy entire photo album. Aaargh.
I using both flickr and google photos, all that gets posted is a link.
Yup. I don't use facebook on my phone because it slows it down horribly.
I'm sorry -- I'm not Android savvy and I don't have an Android anything nearby that I could play with...
Did you ever get things sorted out? While I'm new to this forum and haven't uploaded a photo here before, I've been a forum administrator elsewhere and help my mother with backing up her phone and photos on occasion.