file uploading not working after upgrade to 9.4.019

This started happening with SC 9.4.0.19 (that is my first php7.3 SC version)

When I try to upload any file in any form app in production, all I get is the empty warning below.

Am I the only one?

The upload fields are “Document (File Name)”.
When deployed with SC 9.4.0.12. the same apps were working in the same production env .
The production env has not changed and it’s always been PHP7.3

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file_upload_error.png

Solved,

It was just a permissions issue on the tmp dir.