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A technical problem with the server created an error. Try again to continue what you were doing.

SOLVED

Re: A technical problem with the server created an error. Try again to continue what you were doing.

Same Issue in Magento 2.3. I found the correct file in vendor/magento/module-email and edited line 16, replacing "fileUploader" with "imageUploader" and that fix the issue.

Re: A technical problem with the server created an error. Try again to continue what you were doing.

Re: A technical problem with the server created an error. Try again to continue what you were doing.

So, I had this error because of a bad filename that had an equals sign in it. I didn't realize it because my eye's are not great. Hope this helps someone.