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[最佳答案] Seems I was following the wrong path. CollectionFS has everything I need and more. I now have this working with plenty of scope to do more later. This is one brilliant collection of packages with clear guides on respective Github pages. Here are the packages I ended up usings: cfs:standard-packages - base cfs:gridfs - required for some reason, not sure why cfs:graphicsmagick - thumbnailing/cropping cfs:s3 - S3 upload Code sample →

[最佳答案] This works! – copy/modified from a discussion with Sanjo at GitHub. Only problem is I don't fully understand what's happening. Can anyone help me out? var OriginalsStore = new FS.Store.FileSystem("OriginalPix", { path: pathToOriginalsFolder, transformWrite: function (fileObj, readStream, writeStream) { // write original image to writeStream, no transformations readStream.pipe(writeStream); gm(readStream, fileObj.name()) .size({bufferStream: true}, FS.Utility.safeCallback(function (err