Looks like some Explorer issue, can you try running your computer in Safe mode and try to attach it there?
To run PC in safe mode, check this help article:
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Today I was unable to attach a Word file to an email I wanted to send. I first tried through my Yahoo mail account. I didn't get an error message, the computer screen just got paler while the circular working icon was going. After waiting, I closed the program. After repeated attempts, I restarted my computer and had the same problem. I tried sending the Word file from my Gmail account and got the same problem.
The problem seems to be with just Word, as I had no problem attaching a PDF file.
I haven't made any recent changes and don't have any 3rd party virus protection. I tried the Microsoft trouble shooter with no result.
I have Windows 10 Home and use Chrome as my browser. I've had this configuration on my computer for over 2 years without a problem.
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Looks like some Explorer issue, can you try running your computer in Safe mode and try to attach it there?
To run PC in safe mode, check this help article:
What does it shows on the screen when you try to attach a Word or Excel file - are those files Macro enabled? What are the extensions of the files?
Please share the screenshot of what it shows when you try to attach the file.
I just tried the Incognito mode. Same problem. No response when trying to attach Word or Excel. However I had nom problem attaching a PDF file or photos.
I didn't intentionally load any extensions, not sure if that happens automatically?
Did you try using an Incognito mode (Private Window) of the browser?
If not, please try it and make sure you don't load any extensions in the Incognito mode.
Are you using Word to Send the document to mail or are you using your email and attaching the Word document from the location on your internal drive?