Adding a photo is using an attachment.
What happened earlier with me was trying to "share" from a website, which people generally use for Facebook or Twitter, or Messenger.
Scrolling through, it had the option to share with Telegram app. That appeared to allow my to do so with a comment, however my comment turned out to be a seperate message
Yes.. I first tried the Share option from my BB phone. Then, although I seemed to have an option to "Add a caption.." it wouldn't work. Tapping in the "Add a caption.." only generated a little circle on the top right corner, but typing anything wasn't responding. I'll try a screen shot to show you what I see.
--- tg2fido gate v0.6.1
* Origin: Telegram to fido gate by Stas Mishchenkov (2:460/58)