Panda is not in the Share sheet

I used to be able to Share a markdown document from DevonThink To Go (DTTG, iOS version)to Panda. However, I cannot find Panda in the Share sheet when I want to share a markdown document. Any solution to this?

I can still Share a markdown document from DevonThink (desktop Mac version) and DevonThink to Go (DTTG, iPadOS version) to Panda though. Only iPhone cannot be Shared.

What else do we need to do to get it back in iPhone?

Have you tried to reboot your iPhone? I remember a couple of years ago some users reported the same issue for Bear and turn out it was an iOS issue that was eventually solved (or no longer reported).