Map.addDataFromPath does not add data to path when project instance is created using path.

[AdamPatterson]

I use a path (not "CURRENT") in order to create a project instance e.g.,:

aprx = arcpy.mp.ArcGISProject("Project.aprx")
m = aprx.listMaps("Map")[0]

I'm confident that I have a reference to the map, as I am able to remove layers from the map using `m.removeLayer(LAYER)`.  However, when I run `m.addDataFromPath(PATH_TO_LAYER)` the Layer is not added to the Map.

When I use "CURRENT" in order to instantiate the project, the Layer is added to the map using m.addDataFromPath(PATH_TO_LAYER).

[DanPatterson]

You need to provide the full path, are you doing this?  I presume the above are just examples, if not, there may be something wrong with your path