I have an extension in my app that allows users to pick pictures or video of their "Photos"/"Pictures" app to publish in my app.
I limit the number of picture to 20 and the limit of video to 1. By doing the following : 
However, I want my users to select one picture or only one video. It is not possible with this configuration.
I have read this thread : NSExtension Share Extension limit Photos count
They explained that I can do custom validation rule but I have no idea how to write it.
Is there a another Activation parameter or can someone help with the rule ?
Thanks in advance !
from NSExtension - Share - Limit type only to video or only to pictures
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