On iOS, an error toast appears on the iPhone screen when `File.DeletefileName` is executed, and then disappears

On Android, no problem.
Am I assembling my blocks incorrectly?

That No Available Assets default return value looks fishy.

Try returning an empty text block if not found, and drop it into a variable for testing before jumping into using it for display or delete.

Yes, but the File.Delete method works only with the File component (after File.SaveFile method) on iOS. However, the File.SaveFile method does not return the file path of the saved text file.

Dear @ABG and @Anke , Thank you for your valuable advice.
I will post the value of `File1.DeletefileName` at a later date.

I'll have to double check, but my expectation is that "No available asset" resolves to the empty string, and obviously deleting that isn't possible.

But "valueTagNotThere" isn't the problem—even though it is an empty string, that is irrelevant, since this file cannot be deleted.

Dear @ewpatton , @Anke
This app saves only one file. Even if the file already exists, an error toast will be displayed. The file has been deleted.