I am afraid there is a bit of a confusion here. I use my IPP to actively engage with the documents. Only a few "live" documents I keep on the IPP. My online repository is OneDrive with a partial but updated set residing on a 256GB mSD card on the SP4. I simply pull down whatever documents I need on the IPP when I am on the go. I am also planning to get one of those WIFI-enabled HDDs, which I could use to keep another set of my documents, but also multi-media files.
Also, the SP4 is a big machine for purely digital notebook work. Its 12.5", its a bit heavy enough to deter extended one-handed use. Indeed, this is one of the things that deterred me from the IPP 12.9 though weight-wise it is probably lighter than the SP4 (will need to double check this). Much of this was ameliorated with my use of the S3 (non Pro), but there were issues. For example, battery life was not very good in my experience. Secondly, inking was quite good, but now when I compare with what I experience on the IPP, it feels oddly clunky - but that could be also a function of the apps (specifically referring to Drawboard and OneNote). And anyways, the S3 is no longer in production. There is no news about any upgrades to the hardware. In that sense, it represents a deadend for me - something which I cant understand why MS let happen.
And, to be absolutely upfront about it, there are two other key issues involved. One is the AR - the SP4 (S3 non pro too) has a 3:2 AR as compared to that of the IPP which is 4:3. I prefer the latter. The second thing is apps. For working with PDFs, I prefer Liquid Text (and PDF Expert). Drawboard and Xodo are two of the best apps for the Surface, which don't measure up very well against what is available on the iPad - specifically the aforementioned apps.
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Umm.."he"...
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Thank you!
re: wireless enabled HDD - consider a wireless Filehub that allows to to plug in any USB storage, not restricting you to what's on the wireless drive:
https://www.amazon.com/dp/B016ZWS9ZE
I use one with a 4TB drive and other storage that I can connect to the FileHub for use or into my home network/computers/laptop for access. I also use it for video streaming to my iPad from an HDD. This disconnects the transfer mechanism (WiFi) from the storage mechanism and is more versatile. It's only $40 and works with your existing portable HDDs (if you have them).
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