Hi @Herzi.Pinki; to my understanding, these restrictions on file names are defined by the Wikimedia Commons community itself, rather than by the UploadWizard developers. To my understanding, the Upload Wizard just checks whether a proposed filename matches an entry on the Wikimedia Commons title-blacklist, and displays an error message (hopefully with some information [0]) alongside the 'title' field if it does.

[0] In the case of the title you tried to use, I believe UploadWizard should have shown the message "Please write a more informative title" (or similar); see screenshot below:

In T409641#11356235, @A_smart_kitten wrote:

Hi @Herzi.Pinki; to my understanding, these restrictions on file names are defined by the Wikimedia Commons community itself, rather than by the UploadWizard developers. To my understanding, the Upload Wizard just checks whether a proposed filename matches an entry on the Wikimedia Commons title-blacklist, and displays an error message (hopefully with some information [0]) alongside the 'title' field if it does.

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[0] In the case of the title you tried to use, I believe UploadWizard should have shown the message "Please write a more informative title" (or similar); see screenshot below:

Thanks for the hint, didn't know
(and yes, I got a similar message, but did not understand what more informative title could mean.)

Thanks for the hint, didn't know

No problem :)

(and yes, I got a similar message, but did not understand what more informative title could mean.)

If I'm correct, the filename you entered matched an entry on the title-blacklist for the word 'screenshot' & a date appearing at the start of a title. My assumption would be that this might be because those sorts of filenames might usually not describe the contents of the file itself (e.g., the title Screenshot 2025-11-08.png wouldn't describe what was contained within that screenshot). So in this case, if I understand correctly, the phrase 'more informative title' is referring to describing what's within the file being uploaded.
(For what it's worth, it seems at a glance like your filename did describe what was inside the screenshot, but - as it matched an entry for 'common/uninformative filenames' on the Commons title-blacklist, the Upload Wizard wouldn't have known this.)