@Vincent COUCHARRIERE Thanks for posting in our Q&A.
For volume-purchased iOS apps, we can configure the "Automatic app updates" setting to enable automatic updates.
https://learn.microsoft.com/en-us/mem/intune/apps/vpp-apps-ios#upload-an-apple-vpp-or-apple-business-manager-location-token
For line-of-business apps, it is needed to deploy an update package file.
https://learn.microsoft.com/en-us/mem/intune/apps/lob-apps-android#step-5-update-a-line-of-business-app
https://learn.microsoft.com/en-us/mem/intune/apps/lob-apps-ios#step-5-update-a-line-of-business-app
For other iOS apps and android apps, these app updates are automatic by themselves and their updates not controlled by intune. The following article describes app types in intune.
https://learn.microsoft.com/en-us/mem/intune/apps/apps-add#app-types-in-microsoft-intune
Hope the above information will help.
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