Specified file could not be uploaded, file at temporary:// already exists. Enter a unique file URI.

Problem/Motivation

Despite 🐛 Allow replacing file with same name Closed: works as designed indicating that replacing a file with one of the same name does work, i am getting the following error message:

> The specified file test.pdf could not be uploaded. The file temporary://test.pdf already exists. Enter a unique file URI.

This error traces back to a core validation constraint:

web/core/modules/file/src/Plugin/Validation/Constraint/FileUriUnique.php:19

Steps to reproduce

Upload a file, and then upload a replacement of the same name before cron has run and cleanup jobs are performed.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes