TYPO3 Core

If the php-setting upload_max_filesize is less than 10MB (10 * 1024 * 1024), the following message appears:

PHP Maximum upload filesize too small
upload_max_filesize=8M
By default TYPO3 supports uploading, copying and moving files of sizes up to 10MB (you can alter
the TYPO3 defaults with the config option TYPO3_CONF_VARS[BE][maxFileSize]). Your current PHP
value is below this, so right now, PHP determines the limits for uploaded filesizes and not TYPO3. It is
recommended that the value of upload_max_filesize is at least equal to the value of
TYPO3_CONF_VARS[BE][maxFileSize]

This message suggests that the maxFileSize is relevant here, but in fact it does not influence if the message appears, only the upload_max_filesize is relevant.

Solution: Either modify the message, or change the check.