fs.readFileSync happening before multer uploaded files, ENOENT error

I am developing a platform where users should be able to create a hotel via an HTML form. Inside the form, there is an option to upload multiple image files.

I am using multer to handle the upload. My procedure is the following:

Create directory 'images'

1. Save uploaded images in 'images' directory
2. convert images in 'images' directory to base64
3. save base64-format in an array
4. save array in Hotel MongoDB Schema
5. delete directory 'images'

The upload and saving work perfectly but I get an error when I try to upload the next hotel:

Error: ENOENT: no such file or directory, open 'C:\ ...'

The images are successfully stored in the 'images' directory, but obviously, as the app crashes, nothing is done with the files so I have to delete them manually.

As this is only happening on the second try (when restarting the application, it works again) I assume that fs.readFileSync is executed before the images are done uploading. I am clueless as multer is part of my router chain, the conversion to base64 should happen AFTER all files are uploaded to the server.

What am I doing wrong?

Multer functions: https://i.stack.imgur.com/Wz167.png Base64 conversion: https://i.stack.imgur.com/oOEmR.png Delete function (executed after saving to DB) https://i.stack.imgur.com/PlTvH.png