What is "Other Items" in Photos? Why are there inconsistencies?

Is there seriously no response from apple on this?

OK thanks - so what you are saying is that no one here knows the answer to this question

as it seems to have been asked many times before without success & there is no answer to it

on the apple website.

So can you suggest where to ask? ie. how to ask apple?

Ah! Brilliant! The answer at last!

What a good Old Toad you are!

I used, "Filename - does not include - ".[jpg,jpeg,mpg,mpeg,mp4,mov,avi,png,3gp,heic]"

as the criteria.

I was left with 2 .m4a items which appear to have come from my wife's old phone.

Sadly the way I've written it above is in "GRE" (Global Regular Expression)

syntax which was not accepted (you can't even "paste" into the text box!???) as

a condition criteria.

So I had to have a line for each ".ext".

Now at least I know what those pesky "other items" are!

Thanks!

PS. Can I take back a previous push of a "helpful" button?

In seeking support on this it seemed to become tedious & is best done by saying your problems are with icloud if you have an icloud subscription.

But before I got there, it was answered below by "Old Toad".