CB Gallery autoaction to create an item

The asset should be a gallery asset. So that would normally just be gallery.MEDIA_TYPE.MEDIA_ID. You should be able to just make a copy of the CB Gallery comment stream included with CB Activity then make whatever changes you need for that specific media then I assume you're using CB Auto Actions to insert that comment stream specifically for that media and in that auto action you'd add your conditions to check for profile owner and viewer user id against the asset of the media.

I have a final question on this topic.
Using these triggers :
gallery_onAfterUpdateItem
gallery_onAfterCreateItem

My code runs very well, but I have noticed that when an item is edited through the frontend it seems like these triggers are not called. Is it normal ?
I mean that if I change the file they seem to trigger, but if I only change the name of the file or the privacy settings, nothing happens.

What triggers could I use to cover all scenarios ? 

gallery_onAfterUpdateItem would be called during edits assuming the edit save was successful. If it was interrupted for any reason then only the onBefore would fire.

Answer found

I have one last question on this subject.

Is it possible to condition these triggers to not fire when it's only a change of folder for the item ? or should I code it in my php ?

For gallery_onAfterUpdateItem, yes. var1 is the updated gallery object and var2 is the previous gallery object. You can use that to compare the two objects to see exactly what changed. Example as follows.

Field: Custom > Value
Custom Value: [var1_folder]
Operator: Equal To
Value: [var2_folder]

That should require the folder to not have changed. If you have the same auto action also acting on gallery_onAfterCreateItem you'll probably need to take that into account or separate the two auto actions since var2 doesn't exist for gallery_onAfterCreateItem. You could probably IF condition it though. The below I believe should work.

Value: [cb:if trigger="gallery_onAfterCreateItem"][var1_folder][cb:else][var2_folder][/cb:else][/cb:if]

That should cause it to just compare var1 to var1 if it's the gallery_onAfterCreateItem trigger otherwise will compare to var2.