Having problem loading text files into database as clob.
Try LOADCLOBFROMFILE instead of LOADFROMFILE.
From the manual:
Note: If the character set is varying width, UTF-8 for example, the LOB value is stored in the fixed-width UCS2 format. Therefore, if you are using DBMS_LOB.LOADFROMFILE, the data in the BFILE should be in the UCS2 character set instead of the UTF-8 character set. However, you should use sql*loader instead of LOADFROMFILE to load data into a CLOB or NCLOB because sql*loader provides the necessary character set conversions.