Yes, myCloud supports the new file formats both when uploading and viewing in the gallery as well as in the detail view.
However, please note that this cannot yet be processed by any other software, so an ad outside of myCloud cannot be guaranteed in principle.
even Apple supports these formats only from version 10.13 (HighSierra).
If you want optimal compatibility, we recommend that you change your device's default settings and use jpeg as the default format for your photos.
To change the settings on your device, go to
Settings -> Camera -> Formats -> then switch to maximum compatibility