Switch hosts without rewriting your code.

-- lb-phone/shared/upload.lua, inside UploadMethods.Custom
Image = {
    url = "https://aperture-app.preview.moncompanion.cloud/api/v1/uploads",
    field = "file",
    headers = { ["Authorization"] = "API_KEY" }, -- leave API_KEY as written: lb-phone swaps in the key for that kind
    error   = { path = "status", value = "error" },
    success = { path = "data.url" },
},
-- Video and Audio: the same block, API_KEY included

-- lb-phone/server/apiKeys.lua, server side, out of shared/ which every player downloads; the phone still receives the key at each upload
API_KEYS = {
    Image = "YOUR_IMAGE_KEY",
    Video = "YOUR_VIDEO_KEY",
    Audio = "YOUR_AUDIO_KEY",
}

-- lb-phone/config/config.lua
Config.UploadMethod.Image = "Custom"
Config.UploadMethod.Video = "Custom"
Config.UploadMethod.Audio = "Custom"
Config.UploadWhitelistedDomains = {
    -- add the delivery host to the hosts already listed
    "aperture-app.preview.moncompanion.cloud",
}

-- your resource's client.lua
exports['screenshot-basic']:requestScreenshotUpload(
    'https://aperture-app.preview.moncompanion.cloud/api/v1/uploads',
    'file',
    { headers = { Authorization = 'YOUR_KEY' } },
    function(data)
        local response = json.decode(data)

        if response.status == 'ok' then
            print(response.data.url)
        else
            print('upload refused: ' .. response.error.code)
        end
    end
)

-- server.lua: no multipart here, we send base64
local url = 'https://aperture-app.preview.moncompanion.cloud/api/v1/uploads/base64'
-- one value per upload, reused as is to retry that same upload
local uploadId = ('%s-%d-%d'):format(GetCurrentResourceName(), os.time(), GetGameTimer())

PerformHttpRequest(url, function(status, body)
    local response = json.decode(body)

    if status == 200 then
        print(response.data.url)
    else
        print('refused: ' .. (response.error and response.error.code or status))
    end
end, 'POST', json.encode({
    base64 = captureBase64, -- raw base64 or a data URI
    filename = 'carte_cayo.png',
}), {
    ['Content-Type'] = 'application/json',
    ['Authorization'] = 'YOUR_KEY',
    ['Idempotency-Key'] = uploadId,
})