The "search by file extension" filter in the new search UI only takes into account the main file. Not multiple formats. Even if not many Piwigo use this advanced feature, for those who use it they obviously want it to be taken into account. 
[search] include multiple format for file extension
This is a GitHub Issue
repo:Piwigo
owner:Piwigo
Title : [search] include multiple format for file extension
Issue date:

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The "search by file extension" filter in the new search UI only takes into account the main file. Not multiple formats. Even if not many Piwigo use this advanced feature, for those who use it they obviously want it to be taken into account. 
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