Hello @Eduardo Gomez ,
I noticed that you open this text file by Text Viewer, I download the blue one not this orange one(I couldn't download this app on my Android device), the data can be display. I have to say, it is caused by the app you are opening the file from. You could connect to the APP developer for help. Furthermore, you may also share the text file by email, Word or some other Apps, then check the data.
About sharing files, refer to https://learn.microsoft.com/en-us/xamarin/essentials/share?tabs=android#file
Best Regards,
Wenyan Zhang
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