Binance - Transaction Missing Purchase History

Describe the problem:
I have an error that suggests that a transaction is missing purchase history. I think this has resulted in a conversion from BTC to GBP and then from GBP to BTC in the Binance wallet. I need to rectify this error so that I have confidence in the capital gain amount being calculated is in fact correct. Thanks!

Which exchange/wallet is this regarding?
Binance

How did you import data into this wallet?
Manually, both from a generated CSV report and adding in transactions that are not captured from the csv report (Conversions from GBP to BTC and vice versa)

What have you tried to fix this so far?
everything!

Help. Binance (UK) doesn’t appear to be syncing. It worked until April 26th or so and then nothing, it says it is syncing but doesn’t find any of my more recent trades and purchases. It is missing some of the alt currencies I bought in the last few days. And the error message “Some of your balances on Koinly do not match the balances reported by the API.” is only talking about the 3 currencies I had prior to the syncing stopping importing data. Can Koinly help?