Can you share the error you are getting?

I am not getting any errors. The images are saved successfully, but I don't know where XD.

But I know they are not saved in the volume because I can not access to the images by the path I've previously set /uploads/.... And I've uploaded a lot of images but I see no activity in the volume's metric.

Here is the endpoint where I am saving the images with Node:

import { NODE_ENV, RAILWAY_VOLUME_MOUNT_PATH } from '$env/static/private';

import { json, type RequestHandler } from '@sveltejs/kit';
import fs from 'fs';
import path from 'path';

export const POST: RequestHandler = async ({ request }) => {
    const formData = await request.formData();
    const file = formData.get('file') as File;

    const uploadDir = RAILWAY_VOLUME_MOUNT_PATH;

    // !save file locally
    const fileName = `primera-img${path.extname(file.name)}`;
    // const uploadPath = RAILWAY_VOLUME_MOUNT_PATH + fileName;
    const uploadPath =
        NODE_ENV === 'development'
            ? path.join(uploadDir, fileName)
            : `${RAILWAY_VOLUME_MOUNT_PATH}/${fileName}`;

    try {
        // Create the upload directory if it doesn't exist
        await fs.promises.mkdir(uploadDir, { recursive: true });

        const arrayBuffer = await file.arrayBuffer();
        const buffer = Buffer.from(arrayBuffer);
        await fs.promises.writeFile(uploadPath, buffer);
        console.log('Archivo guardado exitosamente');
    } catch (err) {
        console.error('Error al guardar el archivo:', err);
        return json({ success: false, msg: 'Error al guardar el archivo' });
    }

    return json({ success: true });
};

I have a sneaking suspicion that you're reading the RAILWAY_VOLUME_MOUNT_PATH incorrectly, can you debug log that variable please.

Done. The value is /app/uploads

So, the path were the image is saved is : /app/uploads/primera-img.jpeg. But there is nothing there when I put that path inside the src of an image.

You need to handle serving the file from the volume too, that's not something Railway does for you.

Yes, I know, but according to the docs I should be able to access to the file using the absolute path I've set when creating it, and I am not: " your application will be able to access it at the absolute path /foobar." . Have you tried creating a volume for a SvelteKit project before?

I have not used SvelteKit before, but I've used a volume many times with node without issues.

according to the docs I should be able to access to the file using the absolute path I've set when creating it

Yes you can, as a file path, not as a file server, volumes do not come with file servers.

In +Page.svelte you are using a file path in a img element's src attribute, but I don't see any code to serve the files from the disk at that path.

Aah, ok. I didn't know that. As I've tried again by retrieving the img from my server too and didn't work, I've finally tried another service. As a suggestion: If Railway would offer a service like Cloudlfare R2 or S3 to save files and serve them from your own domain, it would be awesome.

You can already deploy MinIO (a self hosted S3 compatible service)

But of course serving files directly from a volume also works just fine, you only need to write the code to do that.