I did not see .qml on the supported list: https://doc.arcgis.com/en/arcgis-online/reference/supported-items.htm
Is there another format that could be exported that may be supported?
You can put it into a .zip archive and upload that, although you'll need to tell AGOL that the ZIP is a shapefile or GDB.
You may be better off opening the layer in an ArcGIS Desktop program and exporting a style file from there. If you just need to host the QML for others to access, consider using a more generalized file platform like dropbox, or even GitHub. AGOL is really meant for use with ESRI products.
I can also export the symbology from QGIS in .sld. Doesnt look like this is supported either?
Currently this is not supported. Are you using points lines or polygons symbols?
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