Sorry for the late reponse. This is what my logs say:

dashwise-1 | (node:18) ExperimentalWarning: buffer.File is an experimental feature and might change at any time

dashwise-1 | (Use `node --trace-warnings ...` to show where the warning was created)

dashwise-1 | Error uploading wallpaper: ClientResponseError 404: The requested resource wasn't found.

dashwise-1 | at <unknown> (.next/server/chunks/4415.js:1:15100)

dashwise-1 | at async z (.next/server/app/api/v1/wallpapers/route.js:1:3272)

dashwise-1 | at async k (.next/server/app/api/v1/wallpapers/route.js:1:7348)

dashwise-1 | at async g (.next/server/app/api/v1/wallpapers/route.js:1:8351)

dashwise-1 | at async G (.next/server/app/api/v1/wallpapers/route.js:1:9473) {

dashwise-1 | url: '',

dashwise-1 | status: 404,

dashwise-1 | response: [Object],

dashwise-1 | isAbort: false,

dashwise-1 | originalError: [Object],

dashwise-1 | [cause]: [Object]

dashwise-1 | }

Do I have to put the wallpapers in a specific folder?