How to use uploadthing server side?

export const utapi = new UTApi(); // imported from uploadthing/server

// Extract image URLs and upload them to UploadThing
      const uploadPromises = validatedData.map(async (item) => {
        if (item.image) {
          const response = await utapi.uploadFilesFromUrl(item.image);
          if (response.error) {
            throw new Error("Error uploading image");
          }
          item.image = response.data.url; // Replace with UploadThing URL
        }
        return item;
      });