edit OH, I see what you mean-- all my links were changed in my post. Don’t know why. They were in ‘format’ mode. I was using !\\[@filmgal\]\(\https://avatars.githubusercontent.com/u/30246308?s=60&v=4\)\]\(\https://github.com/filmgal\) as an example of what does appear on my phone when viewing an Obsidian page with a link to a picture.
I don’t undertand your reply at all.
I obviously have to add context to my post.
I have a note called Trip to Amsterdam in Obsidian, with 50 pictures.
Rather than put all those pictures in my vault and then linking, I leave them on my server and include them using the link: eg
Three Sisters Cafe in Rembrandtplein
and I link to the picture on my server:

In the desktop I see the picture.
On my Android phone I do not.
BUT, on my android phone I can see some pictures that are entered a similar way, as long as they come from a different website and not my server.
Hence asking about whether the difference is in using http vs https.