Hello,
I have a table with a BLOB column and I am trying to create a report with a download link.
These are the properties of the report column intended for download.

In the page with the report I'm getting:
report error:
ORA-06502: PL/SQL: numeric or value error: character to number conversion error
from Debug:
Exception in "Report 1":
Sqlerrm: ORA-06502: PL/SQL: numeric or value error: character to number conversion error
Backtrace: ORA-06512: at "APEX_050100.WWV_RENDER_REPORT3", line 7965
I've replicated it on apex.oracle.com.