How to read SD Data via Bluetooth / Wireless connection ?

Hello,

I wanted to ask what for possibilitys do I have, if I want to read out a csv file which is stored locally on a sd card which is
connected directly to the arduino.

I am thinking about bluetooth or some wifi connection.
But I do not want the arduino to be connected via Internet, so if I use a wifi modul, the arduino should work like a hotspot.

Is this however even possible to read a csv file via bluetooth with an android phone without writing a special android app?
Because android already has different apps to open csv files.

So the question is, is there a way to get the content from the sd card on my phone/tablet wireless ? :slight_smile:
And if so, which is the easiest way to do this.

King Regards
tonno

One way: