Setting value on variables not allowing copy-paste

Process (in Prototyping):

1. Set Variable (String)
2. Select Target
3. Add String value

Whenever I copy a String using Copy as Text, say, “₱700.00”, from a textbox I have in the Frame, and then trying to paste said value in the Value textbox under Set Variable, it always exits the small Set Variable window and not let me paste “₱700.00” into the Value textbox. I don’t know how else I could paste symbols. Trying the shortcut Alt+8369 on the small window will only get me an unreadable text (see attached image). Help!