When uploading a single player world to Realms that contained both a zipped and unzipped data pack (different packs) only the unzipped pack was uploaded. Unzipping the other data pack and loading to the second slot allowed both to be uploaded.
REALMS-1102
Realms deletes zipped data packs on single player world upload.
Resolved
Fixed
0
This issue has been resolved at some point. I was able to upload .zip-datapacks to my realm earlier this morning.