Incomplete bank statement uploaded

Incomplete bank statement uploaded

We have recently moved to Zoho Books from another accounting package. We imported all estimates, invoices etc. and also imported bank statements going back to 2013. However, for one of the bank accounts, the transactions imported appear very incomplete. There are many small transactions such as bank fees but even so only about 15% of the transactions on the bank statements were imported into Zoho Books. What is the best way to resolve this? Any advice will be welcomed.