We often create TPKX tile packages for offline use in ArcGIS Pro and also in mobile apps like Field Maps. These are created in ArcGIS Pro and are visible in Catalog View. If metadata is viewed in the Catalog > Details Pane, it displays but all fields are blank. If metadata is edited, it populates as edited but when saved, it is gone. Seems like we are close to having metadata for items like TPKX files, but not fully there. Please add metadata support for TPKX files in ArcGIS Pro.