Recently, one of my clients needed to copy a file from one document library to another document library. Previously, I thought to go with content organizer rule as it doesn't work if I drag and drop files to drop off the library through the UI.
So, I developed a flow which will copy the files from one document library and put them to a folder inside document library based on the condition.
Steps
Log in to the MS Flow using your Office 365 credential and create a flow from the blank.
Then select a template when a file is created.
MS Flow - Copy/Move File From One Document Library To Other Library
Add Get file properties action, as I need it to get the metadata of the file.
MS Flow - Copy/Move File From One Document Library To Other Library
Add Condition then give condition criteria based on your requirement.
Add copied file and provide parameter as displayed below.
MS Flow - Copy/Move File From One Document Library To Other Library
MS Flow - Copy/Move File From One Document Library To Other Library
After "Copy File" action and add "Delete file" action.
MS Flow - Copy/Move File From One Document Library To Other Library

As we can see the file is getting copied to a folder inside another document library.
Cheers!!