for me this looks correct for the current version of App Inventor, see also the documentation Storage
SaveFile( text , fileName )
Saves text to a file. If the
fileNamebegins with a slash (/) the file is written to the sdcard (for example, writing to/myFile.txtwill write the file to/sdcard/myFile.txt). If thefileNamedoes not start with a slash, it will be written in the program’s private data directory where it will not be accessible to other programs on the phone. There is a special exception for the AI Companion where these files are written to/sdcard/AppInventor/datato facilitate debugging.
is the documentation not up-to-date anymore?
probably we have to wait for the new version for storing to a shared directory again?
as far as I understand, this will still work in the new version... /Download is a shared directory, so in the new version of the file component you will have to use fileScope Shared together with the path /Download/contactos.txt, see also the design document File component - save (all types of) files in the Private dir (→ internal storage) - #8 by ewpatton
Taifun