Beginning after my last full download on 7/3, downloads for my Fidelity retirement account are always partial. Always the first three transactions of any type. For example, if I have 7 "sell" transactions and 5 "buy" transactions, Fidelity will send 3 buys and 3 sells. The remaining transactions I have to add manually.
Fidelity support rep suggested deactivating and reactivating downloads, and they skedaddled off the chat session before I could inform her that it didn't work.