The reason why IPFS was able to obtain the file, is because it was provided by Siderus gateway.
Once Siderus Gateway has the content it can be share to ipfs.io
You can share big file, but it will take some time in order to be available. An alternative would be to start your own node on a Server and provide the file from there. Alternatively you can use a pinning service, and avoid maintaining it constantly.
In your case it goes on timeout because it is too slow to provide the request. You can try several time untill the gateway will have the whole file.