Gmail Account sync issue - Is there a Limit?

I am new to MailSpring but not new to Email, was looking for a free email client and came across, mailspring it looks like a nice and simple program but I tried to download my gmail account as its kinda full.

but today after setting it up, Mail Spring downloaded roughly around 1100 emails and no older email, sync now doesn’t downloads older emails.
however email arriving on those gmail ID today do gets downloaded, but it won’t go beyond 1100 in fecthing email.

Pop3 is used
pop3 is enabled for all emails on gmail settings.

Any help appreciated,
ESP32 Powered Manu :wink: