Why am I being charged for a software download

[Trueblue]

I have a Samsung Galaxy M10 on O2 PAYG. I am being charged for a software download despite having Wi-Fi setting "on". If I switch off  "Access the internet through your mobile network"  the download stops, it does not transfer to Wi-Fi. Can I get the download via Wi-Fi and if so how. As things stand I have paused the download part way through ( and have been charge for that portion).  BTW I am a 74 year old techno-twit so please keep any replies as straight forward as possible.

Regards Ken   

[MI5]

@Trueblue 

Go to Settings >System Updates (or may say firmware updates) then tap the 3 dots in the top corner to open settings.

Enable the auto download on wifi option.

[Bambino · Accepted solution]

@Trueblue See this for visual help: https://techlogon.com/how-to-make-android-apps-update-via-wi-fi-only/

[Trueblue]

Hi MI5

Thanks for your reply, however the "Enable auto download over Wi-Fi "option was already "ON" 

[Trueblue]

Thanks Bambino I'll check it out.

[MI5]

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@Trueblue wrote:

Hi MI5

Thanks for your reply, however the "Enable auto download over Wi-Fi "option was already "ON" 

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That would make me wonder if you were connected to wifi or if it was actally working?

[Trueblue]

Thanks for that, I think I need to check with my local O2 shop to see if there are any issues with the local Wi-Fi signal (I should have been connected as far as I know). I'll leave it there but thanks for your help.