Error when playing a video downloaded from the Dropbox mobile app on Android

Is this happening only with a particular mp4 file or is it affecting all of your mp4 files Elly1331?

Have you ensured that the Dropbox mobile app and your device's OS are up to date?

Can I ask you to do another test, Elly1331?

If you sign in to your account on dropbox.com and download the file from there instead, does the downloaded file play okay?

Just want to see if this is universal, or related to the mobile app specifically.

Hi Elly1331, could you clarify what you mean by exactly the same? 

Could you attach a screenshot showing what you're seeing when you download the file?

Thanks for the screenshot Elly1331 

Could you try renaming the fie and/or downloading it from another browser and let us know if this persists?

Also, what is your device's exact OS version and the version of the Dropbox mobile app?

When you cleared the app's cache, did you also sign out and back into your account on the mobile app? 

Still the same problem. Android and everything is up to date. I have clear the app cache and tried to download but still cannot and I tried signing out and in also but still cannot. 

I see, thanks for the additional information there Elly1331 

Out of curiosity, have you tried another wifi network or doing this via cellular data to see if that makes any difference?