Video played back once after recording and now wont play at all. ....

[frustratedlowie]

Please can someone help
We recorded our daughter yesterday at a competition via my husbands Galaxy S7 edge. We watched it back and it worked perfectly. However when we went to show our daughter it said unknown error occurred.
The video is saved to the SD card
We are not very technical/
Thank you.

 

[lammy8]

Can you take out the SD card and view/transfer the file to another phone or PC?