You can upload a file by navigating to the Purchases, Sales, Supplier Statements, Expenses or Bank Statement folder, depending on which folder you wish to add items to. Click on “+ Upload”. This will open a new window where you can either select files directly from your computer (In .PDF, JPEG,  TIFF or XLSX/DOC format) or drag and drop files straight into the window:

Here's a quick video showing the full process too:

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