Right now it's a huge flaw you cannot cancel the 'make available offline' download mid-process. Especially since it's so easy to accidentally click the 'cloud' icons on MacOS and suddenly have a whole folder of files downloading. I work in post-production and regularly have folders containing hundreds of gigabytes worth of data in them, and have accidentally made folders 'available offline' several times now...resulting in my computer spending hours or days downloading files only for me to make them 'online only' once again. When you could have Dropbox on an external drive this was less of an issue...as pulling out the drive would effectively crash the download process. Please fix this as its a regular issue me and my colleagues are now having!