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Script Loader: Clarify the "invalid_filetype" upload error message#12017

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TPilgs:fix/invalid-filetype-message
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Script Loader: Clarify the "invalid_filetype" upload error message#12017
TPilgs wants to merge 1 commit into
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TPilgs:fix/invalid-filetype-message

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@TPilgs TPilgs commented May 30, 2026

Trac ticket

https://core.trac.wordpress.org/ticket/65374

Summary

The invalid_filetype error string in wp_default_scripts() (src/wp-includes/script-loader.php) currently reads:

This file cannot be processed by the web server.

This implies a server fault when the actual cause is that WordPress does not accept the file's MIME type. The wording is also inconsistent with neighboring strings in the same $uploader_l10n array, which all explain the cause and suggest an action:

  • zero_byte_file: "This file is empty. Please try another."
  • not_an_image: "This file is not an image. Please try another."

Proposed change:

This file type is not supported. Please try another.

This pattern-matches the surrounding strings, removes the misleading "web server" framing, and tells the user what to do next.

Related

See also Trac #61361, which made the analogous wording improvement to the image-specific noneditable_image message for the same reason. The invalid_filetype string was not touched in that ticket but suffers the same vagueness.

…types.

The previous wording -- "This file cannot be processed by the web server" --
implied a server fault when the actual cause is that WordPress does not accept
the file's MIME type. Match the convention used by neighboring strings in
$uploader_l10n (e.g. zero_byte_file, not_an_image) so users understand the
reason and the recommended action.
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Hi @TPilgs! 👋

Thank you for your contribution to WordPress! 💖

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serabi commented May 30, 2026

Tested using WordPress Playground, fix works as expected!

image

@TPilgs TPilgs marked this pull request as ready for review May 30, 2026 14:09
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2 participants