1. Check if Custom Columns are added in the library:

1. Find the library in question in SharePoint
2. Click on Library Settings in the Ribbon
3. Select Columns under the Columns section
4. Confirm that the column is listed

2. Check if Columns are visible in the library view settings:

1. Find the library in question in SharePoint
2. Click on the dropdown arrow at the far right of the tab to show list settings options
3. Select Modify View under Current View
4. Select the Columns tab at the top
5. Confirm that the column is listed and that it includes an active checkmark. Select Save if it isn’t.