How does Desktop Firefox come into play with your problem?

I am guessing that you are sending those images to your email account at Yahoo!Mail directly from your phone. And it sounds like Yahoo won't allow access to those images files due to Yahoo thinking there's a problem with those image files, and Yahoo blocking those image files from being opened / displayed in the web browser you are using - Firefox - due to that perceived problem.

So, if there is a "checkbox" it would be in the Yahoo!Mail software, unless I misread what you posted or you left something out.

You have not misread what I posted, and I left nothing out.

It appears to be one of those more complex techie things where one company "blames" another for the malfunction. I do know enough about Internet techie things to realize the solution is probably a very simple one, but no one knows where it is.

All I know is Yahoo Support says to check my Browser settings, and since my Browser (Firefox) was recently upgraded, that sounds fairly logical place to start.

Last night I did try using Chrome and got the same results, so It could very well be un-Browser-related; but I do have a Message in to Yahoo as well.

If you would, just ask around and maybe others have had this problem as well. THX for your prompt reply.

I had difficulty finding the exact information I need in Firefox self-support

Seeing that Chrome is affected too, that would lead me to think that Yahoo was the cause.

Let's wait and see what other Yahoo!Mail users may have to say.