V2021 upload tests fail folder on server with write permission 
Author: Kent B.
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Upgrade from v16 to v2021. upload website tests failed. PHP version and Folder on server with write permission. Ignored message and site loaded. No problems observed.
Posted on the
See that your webhosting admin panel has PHP version set on 7.1, or even better if possible set to v8.0
Then check again.