ip/storage===Error404:The requested URL was not found on this server

I meet a problem when I click the storage button or input the address like ip/storage:

it shows me that Error404:The requested URL was not found on this server.

can’t figure it out why
can anybody tell me the possible reason?
I guess if it is because my software version is 2.8(too old?),or some certificate has expired
should I upgrade 3.1 to fix this,or download some URL that it requested?
Please help me,thx.

it results like this

I have seen some Q&A about upgrading from 2.X to 3.X.
It seems that I need remote control to make this,and the ANYDESK app has been installed already.
If I need to upgrade,who should I find or @ ?

@DDJ Hi there, if you have AnyDesk installed, please make an appointment below, and advise the AnyDesk ID when doing so


I book on tomorrow 10AM(in my time zone),with my Anydesk address in notes.
My oral speaking in English is not very fluent.
It may take some time.Does it matter?
My roon type is EX and SW version is 2.8.
Please pay attention.
Besides,does the upgrading need VPN to download some installation files?
If it does,I need prepare for it.