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Check this out. By default the content type is set to application/octet-stream. If you want multer-s3 to automatically find the content-type of the file, use the multerS3.AUTO_CONTENT_TYPE constant.
https://www.npmjs.com/package/multer-s3-v2#setting-custom-content-type
answered 3 years ago
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Hi, I am already using multerS3.AUTO_CONTENT_TYPE and it was working fine until now but it’s not working when I moved the node app to Api gateway and lambda.