Hi,
You have mentioned two issue here - discovery and upload error. Let's work on discovery on given post. Please open separate post for upload.
First, please private message me device SN and let me know what version of SNMP is running on device. Please mention what is CSPC version as well. Depending on SNMP version, you can run SNMP walk from device.
SNMPv2c:
snmpwalk -v 2c -c <ROCommunityString> <IPAddress>
SNMPv3:
snmpwalk -v 3 -u Username -l SecurityLevel (AuthPriv/AuthNoPriv) -a AuthProtocol (SHA/MD5) -A AuthPasswd -x EncryptionProtocol (DES/AES) -X EncryptionPasswd DeviceIPAddress
Thanks,
Supriya