Has anyone figured a good process for categorizing their Amazon purchases and bringing them in?

Here's what I do:

1. Don't let it build up. Every couple of days, look through the cleared transactions (I try not to modify them while still pending) that are not yet marked Reviewed. For each one, search that amount in my email to pull up the amazon order. (I've got 2 monitors so I can keep simplifi on one and my email/web browser on the other.) Click the link in the email to see what the item was, and categorize the transaction. (If it was multiple items in different categories, I use Splits.) As I process each one, I mark it with the Reviewed checkmark.
2. Once a month I get a bunch of items via Subscribe and Save. These charges come through all within a day or two (or three?) and since I do not get an email receipt for each item, I can't use step 1 for these. Instead, once all the charges have cleared (usually a day or so after the S&S items are all delivered), I go to amazon.com/orders on one screen. On the other, I have Simplifi filtered to show me transactions that are not reviewed with the payee "Amazon". I look through the orders and for each that was a Subscribe & Save, I search (manually or using the search box) for that amount in Simplifi, categorize, and mark it as Reviewed.
3. If plan to return an item, I don't mark that transaction as Reviewed until I get the refund. This way, the transaction shows up in my list of unreviewed transactions to remind me to take care of the return. (I rarely use the refund tracker since I'm worried if I mark an item as Reviewed I will forget to return it.)

Writing all that up makes it look a lot more painstaking than it is, in reality it's just a couple of minutes of work every few days, plus more once a month with the Subscribe and Save order (if you use that).

I place my Amazon orders by category, this makes it much easier to track accurately. My record for Amazon deliveries in one day is 7.

Same. though I didnt set it up that way intentionally. its a category I used to use before I reorganized things. But once I noticed that it has this effect, I wound up leaving it as it is.

creating a rule to mark as Uncategoried works for me. Like others, I still go in manually to match up the amounts to the purchase category or split manually as needed.