@Amy_Archibald - I am reading your question very differently from @FLMike.
As I understand it, you have what I am assume is a SharePoint list and there is a field in that list called LOCATION_ID. The data type for that field is Single Line Text.
You have embedded a Radio control inside your Gallery. You want the Radio control to display 3 options. You also want to save the selected option for the selected record back to your SharePoint list, presumably via a Button.
If the above is correct, try:
1. Inside your Gallery, insert a Radio control
2. In the Items property, enter:
["HERE","NOT HERE","OFFFSITE"]
3. Set the Layout property of the Radio control to Layout.Horizontal
4. Add a Button control inside your Gallery
5. On the OnSelect property of the Button, enter:
Patch(
'Your Data Source',
ThisItem,
{LOCATION_ID: Radio1.Selected.Value}
)
6. In the Default property of the Radio control, enter:
ThisItem.LOCATION_ID
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Imran-Ami Khan