I am very confused because it is only with a certain layer. When I try to open this particular feature layer in Desktop ArcMap will crash. This feature layer has customized symbology, could it be because of this?
No ... didn't try it in Pro, Cora said ArcMap.
I wonder why the package would open in pro and not 'map?
Beats me too. Just suggesting Pro since it has a much better integration with portal and most ArcMap users should have access to ArcGIS Pro. Best thing is to log a support case and let Esri dig in to this.
Edit: just for the record, I also tried to open it and it crashed my ArcMap session too.
Nope I do not! But that is interesting to know. I ended up recreating the layer in Arcmap using some better symbols I downloaded from the NPS site. My goal was to host the layer as a feature service so I wanted to upload it back online from ArcMap but since it would crash the program, I couldn't do that. Thanks for both of your help in this!