Nautilus not showing mounted drives in side bar
You need to bookmark them and will likely want to rename the bookmark. This GIF illustrates the technique:
- Pick a partition from your "Other Locations" list.
- Click the upper right "hamburger" (☰) menu.
- From the dropdown menu click the center menu button to bookmark it.
- Move to the new sidebar entry and rename it from the mount name ("c" in my example) to something more meaningful ("Windows 10 SSD" in my example).