One File Instead of Many
Sending five separate PDFs looks disorganized and is awkward for the recipient. Combining them into one ordered document — a proposal with its appendices, a set of receipts, a multi-part application — is cleaner and easier to file. Drag the files into the order you want, then merge.
Lossless and Private
Pages are copied at the object level, so text stays selectable and quality is untouched, and the whole merge happens in your browser with no upload.