altium TI webbench, populate footprint in schematic
It seems that "update schematics" will change the footprint in the schematic if it is set to something, but won't set it if it is not set at all which seems to be the case with altium schematics exported from webbench.

The workaround is to select the components on the schematic and then use the inspector to set the footprint to an arbitary value. After doing this you can use "update schematics" to update the footprints in the schematic to the correct values from the PCB.