Usually I take photos with my iPhone. On my Mac I have a more extensive photo library, and the masters are referenced from an external hard drive.
iCloud Photo Library is enabled on my iPhone, but not my Mac, because I don't want all of the full-resolution DSLR photos on my Mac to fill up my iCloud space. However, now when I take photos with my iPhone, it seems the Mac doesn't download them because iCloud Photo Library is off.
Can I somehow instruct my Mac to download photos & videos from iCloud, but not upload to it? (I see that Photo Stream is a separate option, but I believe it doesn't support videos. It might work to simply not open Photos while my external drive with the large library is connected, so it doesn't upload them, but continues to download in the background — but I'm not really sure that will work.)