The public documentation referencing the App Engine static data file size limitation can be found under '
No single static data file may be larger than 32MB.
The public documentation mentioned previously referencing the Blobstore is no longer up to date. I would strongly recommend using Google Cloud Storage instead. It provides the same convenience of creating and serving large blobs or objects with more fine-grained access control and features. According to the '
Upload Objects' article, the maximum file size that can be uploaded depends on the method employed. For instance, the JSON API, '
Objects: insert' call allows files stored up to 5 TB in size. The client library, this case in Python, allows one to create, remove and control access settings for Cloud Storage objects. This '
Getting Started' guide shows some examples though does not reveal the uploading file size limitation of this particular medium.