Can't work with files on esp32

I want to make a webserver using webserver module. I uploaded an html file via Espruino WEB IDE and wanted to reference it when creating a webserver, I did it in the following way:

var code = require("Storage").readArrayBuffer('web.html');

but when I start my server and browse the page, I see this message:

WebServer error Error: Error: Could not open file : NO_PATH

what did I do wrong?

I'm not sure you're using the code you have above. readArrayBuffer won't report back NO_PATH - that error comes from when you use the fs library with require("fs") (which is a FATFS filesystem)

I use storage library (4 line)

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upd:
I changed the information in 'memory' in var webs to '/' and got this error:

WebServer error Error: Error: Could not open file : INVALID_NAME

That's from the FAT filesystem again. It's the WebServer module you're using: https://github.com/espruino/EspruinoDocs/blob/master/modules/WebServer.js#L188-L189

Looks like when you init the webserver you need to be sure you specifically list your file:

    memory: {
        'web.html': { 
            'content': require("Storage").read('web.html'),
            'type': 'text/html'
        },

See https://www.espruino.com/WebServer#how-to-use-the-webserver-module

... or you can try copying the data into the FAT filesystem:

require("fs").writeFileSync('web.html',  require("Storage").read('web.html'))

At the moment the Web IDE doesn't have the ability to access/upload to the FAT filesystem directly as it's something that got added just for the ESP32

used this, still got error "INVALID_NAME". Btw I uploaded file by this function in the IDE

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I figured out the problem, I had to name the file in memory index.html (I just started studying all this), thanks for the answers and help!