WAL segments held for replcation

wal_buffers = 16MB

1. Can we raise wal segment size to more than 16MB and is it same as `wal_buffers` ?

2. During data loading I'm pushing 4GB data, and taking an assumption that my network is slow,

Will master keep the segments in pg_wal more than wal_keep_segment value such that it's pulled by standby nodes or it will wipe if off?

3. 1024 wal_keep_segments of 16 mb each makes 16GB of segments kept but I have kept max_wal_size = 2GB. Which one will be prioritised max_wal_size or wal_keep_segment?

Thanks!