Windows 10: What is causing mp4s from being removed from motion photos?

Observation:A significant proportion of my motion photos are being stripped of their "motion," the embedded mp4. This is being done without my awareness, seemingly "automatically," and while I have been able to reproduce the issue, the causes I have discovered and uses are NOT the primary cause to this problem, although they may help point us in the correct direction to the true root causeThis is a VERY concerning issue for me that has be rethinking my adoption of the Microsoft ecosystem. To have my files stripped of the precious motion and sound moments is quite bothersome, especially whe

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USB doesn't display MP4 file!

I have a 300kb mix of .png, .jpg, .pdf files on a 4Gb USB drive. I added a 2Gb MP4 movie but it doesn't display in the drive files. I used CCleaner to check the drive F files .. it only shows up as 2Gb of OTHER FILES, but not in the listed files.

Any (constructive) suggestions welcome. I can't remove it as it doesn't show in the file list.

 

Playing MP4 files

MP4 is a container file, a lot depends on the codecs within that.
MP4 can be played with Windows 10 with Films & TV, Photos, Windows Media Player, and VLC.
If those can't then there must be something odd/unusual in the file.

Right click the File > Properties > Details Tab.
see if that gives you more info, should be some info on the video/audio but not codecs.

Try the suggestions from post #3.

You have to be careful as viruses are propogated by people simply changing the filename extension and auto-forwarding via an infected PC and a compromised address list.
So a targeted scan with AV is necessary for every file attachement even if apparently from someone you know.

 

Lost default photo viewer after profile rebuild

Thanks Brink. I've tried those steps before i started searching Google. After the profile rebuild i don't have the Photo app listed to choose to make it default in either the system settings for default apps or the Open With option.

I can't even find it doing a search. Seems to have been removed somehow with the profile rebuild, which doesn't make sense.

Might be helpful to list what i've done I've done the open with check, the choose default program in the system menu, tried that in device manager default programs also. I've checked the programs and features Turn windows features on/off and it's not listed there (never thought it was but that was a suggestion), searched the MS Store, it's not listed there either.

I don't like playing in the registry unless i have defined steps and haven't found anything for this yet, just the Win7 version like in my OP.