Task: Bulk Emails with personalized attachment

n8n workflow:
{"id":1,"name":"My workflow","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[320,300],"parameters":{},"typeVersion":1},{"name":"Send Email","type":"n8n-nodes-base.emailSend","position":[1520,300],"parameters":{"options":{"allowUnauthorizedCerts":true},"subject":"Certificate For Course","toEmail":"={{$node[\"SplitInBatches\"].json[\"email\"]}}","fromEmail":"bhavabhuthi@riseup.net","attachments":"data"},"credentials":{"smtp":{"id":"1","name":"SMTP account"}},"typeVersion":1},{"name":"Read Binary File","type":"n8n-nodes-base.readBinaryFile","position":[560,300],"parameters":{"filePath":"/home/shashikanth/Documents/Cert-Gen-Test/data.csv","dataPropertyName":"csv"},"typeVersion":1,"alwaysOutputData":false},{"name":"Spreadsheet File","type":"n8n-nodes-base.spreadsheetFile","position":[840,300],"parameters":{"options":{"headerRow":true},"binaryPropertyName":"csv"},"typeVersion":1},{"name":"SplitInBatches","type":"n8n-nodes-base.splitInBatches","position":[1080,300],"parameters":{"options":{"reset":false},"batchSize":5},"typeVersion":1},{"name":"Read Binary File1","type":"n8n-nodes-base.readBinaryFile","position":[1300,300],"parameters":{"filePath":"=/home/shashikanth/Documents/Cert-Gen-Test/generator-output/{{$json[\"name\"]}}.png"},"typeVersion":1}],"active":false,"settings":{},"connections":{"SplitInBatches":{"main":[[{"node":"Read Binary File1","type":"main","index":0}]]},"Read Binary File":{"main":[[{"node":"Spreadsheet File","type":"main","index":0}]]},"Spreadsheet File":{"main":[[{"node":"SplitInBatches","type":"main","index":0}]]},"Read Binary File1":{"main":[[{"node":"Send Email","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Read Binary File","type":"main","index":0}]]}}}