Hi Onyekachi Nwakaihe, I was faced with a similar problem and interestingly the solution was relatively simpler than I thought:
Step 1:
Go to the App Vales Tab

Step 2:
Tap on the \"Add App State Variable\" button and add an App State variable. Use any name of your choice in camelCase format and select \"Create\". Leave the other settings as they were:

Step 3:
Go to goole and search for the currency symbol of your choice, highlight and copy the symbol to your clipboard by just hitting Cmd + C on your keyboard:

Step 4:
Return to FlutterFlow and Paste the currency symbol in the empty variable field you just created:

Step 5:
Create a text widget, and bind that text widget to your new currency variable:

It should look something like this when you do. Run the app to see if your currency displays accordingly.
You can dynamically change the currency by updating the App State variable you created.

You can also add a default currency value in the Text widget variable binding property panel:

It works perfectly for me even after downloading the APK and installing on a device.

I hope this works for you.
Cheers!!

Currency Not Displaying