TYPO3 Core

Update: The sorting on FAL properties is well implemented in FilesContentObject - however it is not documented how one can sort by FAL attributes correctly, and if there is no possibility in the backend (like the existing dropdown), the feature will hardly be ever used.

For documentation purposes:
Sorting filelink lists by FAL properties this way will not work:

tt_content.uploads.20.sorting.field = title
tt_content.uploads.20.sorting.direction = desc

Instead, sorting filelink lists by FAL properties is made with the following TS:

tt_content.uploads.20.sorting >
tt_content.uploads.20.sorting = title
tt_content.uploads.20.sorting.direction = desc

Purging the sorting-Config is needed, since by default stdWrap is used because of the default presence of the sorting.field key. As long as this key is present, sorting on FAL properties will not work, since in the context of stdWrap, the FAL properties are not present (only tt_content properties are present). Instead, the sorting of FAL properties has to be stated directly in the sorting key.

That's quite not obvious to understand for new users, therefore I'd suggest for 7.x implementing for filelinks a GUI dropdown in the backend, so the user can chose on which FAL property he wants to sort - also if ascending or descending.

Regarding me, the issue can be closed, or converted to a feature request.

Since fluid_styled_content is used, the typoscript for upload list sorting by FAL title has to be:

tt_content.uploads {
dataProcessing {
10 {
sorting >
sorting = title
sorting.direction = desc
}
}
}

But i think, this should better be an option to configure in the backend…

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/59897