Hopefully this is just a bug - i'm about to explode how stupid Apple programmed the photos app if this is the truth Until tomorrow i stored my "iphoto library" at the time capsule. Just like any other file. iPhoto doesn't have any problems with this. i can activate the icloud funktions - all worked fine. And that was good cause nobody (except prof photographers) want to stuff their limited SSD-Space with a photo library. So i installed 10.10.3 - started the new photos app with "pressed ALT-Key" - generate a new library on my TC. So fine - But than i go to the preferences - icloud tab and want to activate it --> FAIL !! (see Screenshot) Here is a simple translation of the message The iCloud Photolibrary is only available on volumes formatted with Mac OS Standard or Mac OS Extended. To check the format of your volume go to finder and open the information for the volumen. the format ist displayed in the field "Format". Am i really the only one who outsorces his library on a time capsule or air port extreme with a integrated HDD ? I can't believe that Apple was so stupid and is not able to enable icloud functions on a library that's stored on an Apple Device ?!? I can't see the "real format" of the TC - cause the TC is mounted by AFP:// (just normal i think) Searching via google gives no save answer. Some say that the TC is formated with HFS+ (in that case i wonder why this error above pops ups) - and other say that it can't be HFS+ cause Windows can't read/write on HFS+ And now ?!? Crossing fingers and thanks in advance for any information given.