Backend Response Time Limits

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Hi I'm working on a website where user can upload more then 30 images at a single time. I make custom button through HTML and JS  on the page. first all images upload in wix-media then url's will stored in our collection. I was upload image one By One in a for loop. 
everything working  fine for small size images(350kb),  we can  upload more then 30 images at a single time .
But when I try to upload images more then 1 MB , 
function give an error, You can see in bellow img
i think wix have limitations, If backend function not respond in 59Sec It give error 
Question is How can we increase The time limit of backend response

1027×735 262 KB

export function uploadImage(buffer, mimeType, name) {
return mediaManager.upload(
“/uploaded”,
buffer,
name, {
“mediaOptions”: {
“mimeType”: mimeType,
“mediaType”: “image”
},
“metadataOptions”: {
“isPrivate”: false,
“isVisitorUpload”: false,
“context”: {
“someKey1”: “someValue1”,
“someKey2”: “someValue2”
}
}
})

// This is upload function in backend and i send 1 by 1 image, buffer and type everything is perfect.