I can't edit my Microsoft files on the mobile app.

Do you have an app on your phone to open and edit the files? Dropbox simply gets the file to the phone and shows a preview of it, it doesn't control the editing or resaving of it

Thank you for helping me. 

So, you said that i cannot edit or modify my word files with an app on my smartphone regardless of plan(basic, business, business plus, enterprise). is that right?

Hey joonhwa! What Mark meant is that you can’t edit those files with the Dropbox mobile app.

You’ll need to download the Microsoft app for Word on your phone instead and edit the files there. Your updates should sync to Dropbox normally.

Did you download the Microsoft Word app for editing documents? If not, can you give this a go and let me know if you still have an issue? 

Feel free to send me a screenshot, as well.

Thanks for the screenshot, joonhwa! Did you check my previous question about the Microsoft app you can use to edit your files?

Thank you for helping me but, I don't understand your question. I already told you in my previous reply that I downloaded microsoft word app on my smartphone and tried to edit my file with an app.

please check my answer for your question and reply me. thank you.

Hi joonhwa, are you opening your docx file directly from the Dropbox mobile app, which would then open Word?

Are you trying to open the file from Word instead without using the Dropbox app?