Daniel Neto

Are those credentials correct? Can I try it locally? Is the bucket name correct? rielcomms keyID: 002679333bd1b940000000007 keyName: rielcomms applicationKey: K0021us3NOvNVENSFKyyvqNfrg48QSg

Looking at the expected key format, looks like you are not copying the correct ones  check here where to grab them https://github.com/WWBN/AVideo/wiki/BackBlaze-B2-plugin#using-a-bucket-specific-application-key

MUST be the master key 

Please recreate the masterkey and share them here. also please manually upload a file to your bucked and share a link here to access the file

Please screenshot the bucket name and keys coinfiguration, # also please manually upload a file to your bucked and share a link here to access the file

This works for me  

the videos with errors are lost, you must upload new videos now

That is not an error. That means the backblaze is working

I mean , the imagens pasted is not an error please see the values I have set and copy them

This is probably because you do not have the plugin parameters setup as I do in the image above also make sure your plugin and avideo are up to date