Why aren't the PowerShell functions from the downloaded ps file being executed?

Question

PowerShell

I'm trying to run any function defined in the file
C:\Program Files\IIS\Microsoft Web Deploy V3\Scripts\BackupScripts.ps1
according to the documentation of
Web Deploy Automatic Backups
powershell swears that the function was not found:

Picture

I also tried to step through the script in the debugger, the BackupScripts.ps1 file is executed, the debugger goes through it, but the functions defined in it are still not available, example:

$script = "$($Env:ProgramFiles)\IIS\Microsoft Web Deploy V3\Scripts\BackupScripts.ps1"
& $script
TurnOn-Backups $true

Picture

BackupScripts.ps1 file

Answer 1

and if you load a file with functions like this: a
space between two dots.