Only 2 GB of music on Apple Watch and 75 MB For Photos
Apple officially confirmed that Apple Watch has only 8 GB of memory. Versions of the device with a greater storage of time will not have, and only 25% of the internal memory may be used to store music.
These 2 GB is sufficient for about 200 songs. Storage of images is also limited – only 75 MB. With the compression Photos application of smart watch applied basis where download the files from iCloud, this storage is equivalent to about 100 photos. The rest of the internal memory will be used by the operating system and resources of external applications.