PDF documents can be imported and edited depending on how the PDF was originally exported.
The importing of PDF documents is a one-way process. You cannot overwrite the original file once it has been imported, instead saving it as an Affinity document. However, you can edit the PDF content if page objects remain editable from the original export; you can then export the file as another PDF.
To import Adobe PDF documents:
Do one of the following:
From the File menu, click Open.
Double-click anywhere in the empty view. (Only available when no other documents are open.)
Select the file you want and click Open.
From the PDF Options dialog, you can choose:
Load all pages/Load pages—All pages or specific pages (by page number) can be imported.
DPI—sets the resolution for the document. The Estimate option reads and uses the resolution of the PDF file.
Colour space—sets the document colour space (e.g., RGB or CMYK) that PDF contents will use. The Estimate option senses the PDF file's colour space and uses that.
Favour editable text over fidelity—if text is to remain more editable at the expense of accurate design reproduction.
Group lines of text into text frames—If separate text lines can be treated as a single text frame to aid text flow.
Replace missing fonts—when checked, missing fonts are substituted with the suggested replacement font family/style or a font family/style of your choosing.
To import Adobe PDF documents (via Finder):
Open Finder and drag the PDF file to an off page area of your workspace.
To import Adobe PDF documents (via Explorer):
Open Explorer and drag the PDF file to an off page area of your workspace.