Hello @JSchelb
Must a document that has been modified be available at once at the other SharePoint sites?
I ask as it can happen that while modifying a document, the flow will be triggered several times, each then trying to copy the document to the other locations.
If a modified document must only be available within 24 hours, then you could set up a recurrent flow that will copy all documents that have been modified within the last 24 hours. Just an idea.
You may have to cope with the situation when a copy action fails, due to the target document being locked by someone, unless the locations have read only permissions for all other people.
Anyway, if your flow as you posted it, is what you need, then you do not need a condition, just the trigger action and the copy action should be enough.
If you have several locations to which to copy one document - seems like you have - then you could consider using another list to hold the target location information (site and library).
Kind regards, John