I realise my knowledge on file formats is very poor, so forgive me if the question is a stupid one... I have a process that works today so I haven't previously needed to worry! (Yes, I'm almost certainly muddling dpi and ppi too!)
The printing company that I use request that the work I send (always a single page document) is TIFF, 300dpi. To do this in my current Adobe world I save a 300dpi pdf from InDesign. I then open it in Photoshop, scaling it to the size that I want as the pdf is opened. I do nothing to it except save it to TIF (with image compression LZW). That file goes to the printer.
If I am to move to Affinity world (fingers crossed) I can't yet see how to achieve the same. I have opened the file (IDML) in Publisher and have used the Export to TIFF option - but the resulting file is 192ppi, and I don't see how to alter it.
I'd really appreciate some help thank you.