Safari update 14.0.1 issue uploading files

Workaround I've found is to manually open up a new finder window, locate the file and drag&drop it on the 'file upload' button you want to use.

For websites where you can drag and drop files to upload, like gmail and google drive, doing so will upload the file. Only the upload or attach BUTTON seems to not work.

I have installed today Safari 14.0.3 from updates and file uploading problem is solved. I am running on Mojave 10.14.6

I reinstalled the OS as had been suggested and that fixed the problem temporarily. I noticed it put Safari back to version 12. After the reinstall there were security and Safari updates. Once these were installed and Safari was taken up to version 14.0.1 it started failing again. So if you have reinstalled the OS to resolve the issue do not perform any updates or else it will fail again.

One workaround (if the website you're using supports it) is to use drag and drop from the Finder rather than browse/ upload. This works fine for me in outlook (office365 browser version), prestophoto and other web systems in the institution I work for.

I've reported it via user feedback.

My solution was to re-install macOS 10.14.6 via Internet Recovery - that version comes with Safari 12.1.2 which does work. Now I just have to make sure not to install any of the Safari "updates" of 14.0.1 and 14.0.2 both of which are listed as need updates. What a mess!

Safari 14.0.x work fine on Big Sur (on my M1 Mac mini) it is just Mojave on the Intel Mac mini with the issue. Unfortunately I need 32 bit for software development and certain printer and scanner drivers. My solution was to reinstall Mojave and do the updates but NOT the Safari 14.0.1 and 14.0.2 updates. 14.0 is fine.

A bodge till Apple fixes it is manually open up a new Finder window and drag&drop the file onto the webpage's attach button.

I downloaded OS Catalina from the link supplied by Tootsall222 above (many thanks for that), upgraded my system to Catalina and hey presto - all working fine now, issue resolved!!

saundersndu found the 14.0.3 beta - it worked for me https://developer.apple.com/safari/download/

I just installed 14.0.3, and YES! I can now upload attachments! Thank you all!

Yeah, it appears to have worked. Am now using 14.0.3 and can upload attachments again

I have the same problem, using Mohave 10.14.6. Can't upload files in Microsoft Word and several other programs. No problem in a different browser.

It's fixed in 14.0.3. Just update the software.

Yes there is - Upgrade Safari to 14.0.3 as mentioned above.