If you're sure other users can't see them, update to HEAD.

If you believe other users can't see them because the file page says that the visibility policy isn't what you expect (in the page subheader), check the "attached" tab. Users who can see "attached" objects can also see the file. You can click the file policy in the subheader to learn policy rules, including this rule.

OH

Phame

Sorry, misread. Ignore me. This is probably a bug on our side.

If it helps, the phame post doesn't show up under the 'attached' tab on the
file.

(In fact, there's no attached tab even present)

Phame doesn't use application transactions so the fix here is to move it over to use an Editor + transactions and this comes for free.