Had similar problems with PDFs in Chrome before, especially when uploading forms that looked completely fine locally. It is frustrating when the browser says the format isn't recognized even though it's clearly a PDF. I ran into a comparable browser compatibility issue while opening https://bcgamedk.com/ recently, so sometimes switching browsers really is the fastest workaround. Still, basic PDF uploading should just work without users having to troubleshoot it themselves.
Had similar problems with PDFs in Chrome before, especially when uploading forms that looked completely fine locally. It is frustrating when the browser says the format isn't recognized even though it's clearly a PDF. I ran into a comparable browser compatibility issue while opening https://bcgamedk.com/ recently, so sometimes switching browsers really is the fastest workaround. Still, basic PDF uploading should just work without users having to troubleshoot it themselves.