Unable to find previously uploaded files to delete in order to download.

So i have been working on an hour+ long video, and now i'm ready to download. However, i am unable to reaon being: "ione asset failed to upload. Re-upload or try different asset". 

Problem is, I have a lot of assets and don't know which one one failed (audio, video and still images). It says the asset will be marked with grey bar, which i cant see anywhere. How do I find this asset and delete it. Gosh all assets in uploads look fine (no grey bar or red exclamtion mark or anything) How am i suppose to figure out whuich is the ito remove and reupload??? 

Please help, cos honestly, im fed up wityh this.