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anidel-
No worries.
I want to do the "right thing"... which is moving to this new browser supported API that handles the image upload.
But it verges on being too early, and Firefox is handling the old way of doing things badly.
What I don't want to do is to put in an awfully complicated patch that doesn't give us the new thing, nor remove the old thing, and just makes a mess I have to spend ages unpicking later.
Velocio
I have docs on the Files API https://developer.mozilla.org/en-US/docs/Web/API/File/Using_files_from_web_applications but need to weigh up whether fixing it will affect more people than not fixing it as https://caniuse.com/#feat=fileapi shows that UK usage is only 60% support it fully, and only 78% support it fully or partially.
In theory the % that do support it is all of the modern browsers, but in practice I bet a load of people are using old work computers to access this site.
Even after I've figured that out... I'd still need to write all of the code.
It will be a little while... the workaround is try to and attach twice, it works the 2nd time (twice before submitting the comment).