Task: Add data from Google Sheet to Dropbox

n8n workflow JSON:
{"nodes":[{"name":"Read Sheet","type":"n8n-nodes-base.googleSheets","position":[450,300],"parameters":{"sheetId":"1GT2dc0dOkAC1apY0UlTKY9vitBl8PtKrILvFiAy5VBs"},"credentials":{"googleApi":""},"typeVersion":1},{"name":"Convert to XLS","type":"n8n-nodes-base.spreadsheetFile","position":[650,300],"parameters":{"operation":"toFile"},"typeVersion":1},{"name":"Upload Dropbox","type":"n8n-nodes-base.dropbox","position":[850,300],"parameters":{"path":"/my-sheets/prices.xls","binaryData":true},"credentials":{"dropboxApi":""},"typeVersion":1},{"name":"Trigger all 15 min","type":"n8n-nodes-base.interval","position":[250,300],"parameters":{"unit":"minutes","interval":15},"typeVersion":1}],"connections":{"Read Sheet":{"main":[[{"node":"Convert to XLS","type":"main","index":0}]]},"Convert to XLS":{"main":[[{"node":"Upload Dropbox","type":"main","index":0}]]},"Trigger all 15 min":{"main":[[{"node":"Read Sheet","type":"main","index":0}]]}}}