Bash Script - Curl (Filename Too Long Error)

Please read carefully, otherwise i dont answer auto bids. I get error FILE NAME TOO LONG #!/usr/bin/bash BACKDIR=/home/ykose/yedekBOX DATE=`date +'%m-%d-%Y'` WPDOSYA=`for file in $BACKDIR/*$[login to view URL]; do echo "${file}"; done` BASE64=$( base64 $WPDOSYA -w 0) curl -X 'POST' \ '[login to view URL]' \ -H 'accept: /' \ -H 'Authorization: Bearer $2b$10$DQmaItvVtZUUpEDCwGLPCOazPAms02NytCa81uWTQgVqJcS4_5g4m' \ -H 'Content-Type: application/json' \ -d @< '{ "phone": "999999999", "filename": '[login to view URL]', "base64": "data:file/pdf;base64", '$BASE64', "isGroup": "false" }' How can i fix the FILE NAME TOO LONG error? $20 for the correct answer.