My Skandi flat pack explanation.

Computer stuff moves forwards quite quickly. This means some bits fall out of sync.
We have two free of charge services that are not selling our information or charging us for our daily fix.

A file is encoded and given a suffix (.jpg) to identify it. This allows an application to know if it can use it or not.
These suffixes have been around since mice. They started with 3 letters and were then extended to 4.
Image files had a selection of formats including .jpg and .png for example.

Older applications may not understand some newer extensions, so a newer format such as .jpeg might not be understandable to older software.

TM does not currently understand .jpeg as TM is a slightly older package.
IMG does understand .jpg and .jpeg.
Anything already posted to the site continues to work.
However as we try and add a new image through IMG it is failing.
When you currently feed IMG an older format like .jpg it tries to be helpful and converts/upgrades it to a newer .jpeg during ingestion.
This results in it not being understood by TM.

I got around this by using a file saved in .png format.
I used a simple image file application (MS-Paint) to open the file and then saved it as XXXXX.png
I then ingested this .png file into TM-IMG and the links worked.
PNG has not been updated so is consistent between them.

You can edit a file name, this does not work. Editing the name from xxxx.jpeg to xxxx.jpg results in the software being unable to decode the content.

Peter is aware but I fear the issue will in be effectively solved in an upgrade to allow TM to understand a more modern .jpeg format.

Everyone loves a Morgan. Even me, unless it's broken again.