Does not Backup any MMS messages

[saymahub]

Expected behaviour

Backs up MMS messages and attachments into gmail logs

Actual behaviour

Only backs up SMS message

Steps to reproduce the behaviour

As indicated in the screenshot, I selected MMS messages, attampted a backup, and found that there were no messages to backup for some reason, despite the majority of my recent texts being mms.

Please specify the following:

• Android version - 10
• Phone model / brand - Samsung Galaxy S9
• SMS Backup+ version installed - 1.5.11
• Messaging app - built in messaging app

[kurahaupo]

It's likely that what appear to be MMS messages are in fact RCS messages.

Does your messaging app have any way to check the "technical details" of a message to see which transfer protocol it used?

Background

RCS is a new protocol that provides the same features as MMS, but uses completely different mechanisms: instead of using telco "channels", and insanely expensive Telco-grade store-and-forward, RCS uses end-to-end IP (probably TCP), so it can negotiate features between devices.

But beyond that, there's not much information available. Last I looked (about a year ago), the Android RCS API documentation was available only to telcos - presumably under an NDA - and unusable by any open source project.

Unfortunately RCS vs MMS vs SMS is dictated on a message-by-message basis by the sender; the recipient just has to cope.