This is the error record saved by the group members at that time,
February 23 15:28:52 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:52 Fedora Jami [12365]: Upload pack command detected
February 23 15:28:52 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:52 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:53 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:53 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:53 Fedora Jami [12365]: Upload pack command detected
February 23 15:28:53 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:53 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:53 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:53 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:53 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:53 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:53 Fedora Jami [12365]: [device 75e1864d70f83c69533dc55c4fa8a7e28012e5ca49a19c0ebcc69a59036561c2] Peer already connected Add a new channel
February 23 15:28:53 Fedora Jami [12365]: Invalid add file detected: invited/{Jami ID} 2
February 23 15:28:53 Fedora Jami [12365]: Malformed text/plain commit 2c3b7ebd29b93a650504ba3b72af5a25098835ec Please check you use the latest version of Jami, or that your contact is not doing unwanted stuff
I failed at the time, but later succeeded, indicating that the message itself was not a problem, and I only sent normal text messages and emojis.
My desktop is the latest stable version (as of 2.26), Android is 405, and the versions in my contacts are relatively new