tengo el archivo que busca la aplicación en la memoria interna del celular.
Welcone
It would really help if you provided a screenshot of your relevant blocks, so we can see what you are trying to do, and where the problem may be.
To get an image of your blocks, right click in the Blocks Editor and select "Download Blocks as Image". You might want to use an image editor to crop etc. if required. Then post it here in the community.
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.
Where does this file (clave.txt) come from and where is it located?
almacenamiento interno del celular
see here Some basics on Android storage system
my guess is, you are trying to read a non media file, which has not been created by your app, which means, you will have to use SAF to read it
Taifun
