如果换成图片很小的，几k的大小就可以正确调用云函数。

WAServiceMainContext.js:2 (in promise) MiniProgramError

cloud.callFunction:fail -404012 polling exceed max timeout retry. (callId: 1646458468314-0.7419272625279247) (trace: 13:34:28 start->13:34:28 app show->13:34:43 timeout, retry->13:34:58 app hide->13:34:58 timeout, retry->13:35:2 app show->13:35:4 app hide->13:35:13 timeout, abort)

Error: cloud.callFunction:fail -404012 polling exceed max timeout retry. (callId: 1646458468314-0.7419272625279247) (trace: 13:34:28 start->13:34:28 app show->13:34:43 timeout, retry->13:34:58 app hide->13:34:58 timeout, retry->13:35:2 app show->13:35:4 app hide->13:35:13 timeout, abort)

at S (WASubContext.js:2:242573)

at Function.<anonymous> (WASubContext.js:2:265437)

    at Generator.next (<anonymous>)

at n (WASubContext.js:2:2196)

at s (WASubContext.js:2:2399)

https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/ocr/ocr.printedText.html