File can be modified in onshape by making a copy
https://cad.onshape.com/documents/c85f7b2c0bf8a92f97e4ee7d/w/69ea7d517ddfd8657440cbc2/e/82f26e0e131686919eae011a?renderMode=0&uiState=66dd69e320e3c37959b8d0ef
The author marked this model as their own original creation.