I'm reorganizing my folders. Right now all photos are in one Folder plus many s/f on ext HD. I want to move photos from Folder to Another folder on same ext HD, but I first have to somehow create Another. LR isn't letting me. It tells me this often without explanation. This shouldn't be so hard. Please send help.
The 'trick' is to do all this moving within LR itself. It can move, rename, create folders; virtually all the functionality of the Finder but doing so within LR allows it to 'know' what you've done and where everything resides. LR should have no issues creating a new folder itself unless you don't have permissions or a similar restriction. Be useful to know your OS.
Author “Color Management for Photographers" & "Photoshop CC Color Management" (pluralsight.com)
Another solution is by selecting all of the files you want to move to a different folder, you must do this within Lightroom. In library module open the folder tab so you can see your ext Harddrive. Right click on folders and sub folders and make sure "show parent foler is selected." You can than right click on external harddrive and you have a option to create a new folder. Make new folder, than a widow comes up and you have the option to move selected photos to new folder.