In Qlik replicate when you set Snowflake as a target the maximum LOB size you can set is 16MB (16384 KB) as per snowflake data type documentation. Specifying anything bigger than this will result in errors being returned. I think it would save people a lot of time to set this option to 16384 KB when snowflake is selected as a target and grey it out. I can see many people wasting a lot of time and a lot of trial and error figuring this out and eventually making it part of their standard setup.
https://docs.snowflake.com/en/sql-reference/data-types-text.html