Create folder, Delete and upload APIs in Dropbox iOS SDK gives DBRequestErrorRateLimit error

If you check the DBAUTHRateLimitReason, is it isTooManyWriteOperations? That indicates that it's not explicit rate limit, but rather a technical inability to make multiple modifications in an account at the same time. Note that the simultaneous changes can be from either the app itself, or other clients acting on the account. (E.g., the official Dropbox desktop client, another API app, a Dropbox mobile app, etc.)

If it is coming from your own app, you'll just need to avoid making multiple simultaneous modifications like this.

There also some optimizations you can make. For instance, use the batch versions of methods, when available, such as deleteBatch and uploadSessionFinishBatch.