> For the complete documentation index, see [llms.txt](https://guide.highway.gov.sg/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.highway.gov.sg/for-agency-users/agency-faqs/general.md).
# General
## What file types are allowed?
We currently support uploading of these following file types below.
Documents: ‘doc’, ‘docx’, ‘ppt’, ‘pptx’, ‘xls’, ‘xlsx’, ‘csv’, ‘pdf’, ‘rtf’
Images: ‘bmp’, ‘png’, ‘gif’, ‘jpeg’, ‘jpg’, ‘svg’, ‘tif’, ‘tiff’
Videos: ‘mpeg’, ‘mpg’, ‘wmv’, ‘avi’, ‘mp4’
Audio: ‘m4a’, ‘mp3’, ‘wav’
Others: 'asc', 'cer', 'csv', 'dot', 'dxf', 'ent', 'htm', 'html', 'log', 'mpp', 'msg', 'mso', 'odb', 'odf', 'odg', 'odp', 'ods', 'odt', 'p7m', 'gno', 'p7s', 'pcx', 'pot', 'pps', 'ppsx', 'psd', 'pub', 'rtf', 'sxc', 'sxd', 'sxi', 'sxw', 'tar', 'txt', 'vcf', 'vsd', 'xml', 'zip', '264', 'edr', 'jdr', 'ts'
## What are the file size limits?
The current file size limit on Highway is 1 GB per file, but there are no restrictions on the total file sizes per submission link or per collection.
## What data classification and information sensitivity can Highway handle?
Up to Restricted/Sensitive Normal.
## Can recipients submit files multiple times via the same submission link?
Yes, this is possible. Please note to set a longer expiry date for your submission link if you wish to allow your recipient to have access to your link for repeated submissions.
## Can collections and submission links be deleted?
Unfortunately, this is not a feature that is available at the moment.
## Why can't I upload files from my GSIB/HVB?
Highway is designed to enable file collections from citizens and not for government / healthcare / education officers to share files externally, hence uploads from certain IP address has been banned intentionally.
## I have lost my Secret Keys! What should I do?
If you have lost your secret key, take these steps immediately:
1. Create a new collection and **save the secret key securely**. Then create a submission link in that collection and share it with the citizen so they can submit through it instead. Let the citizen know as soon as possible to avoid delays in receiving further submissions.
2. On the computer you used to create the original collection, **search for ‘Highway Collection Secret Key’**. Secret keys are downloaded as .txt files with ‘Highway Secret Key’ in the filename.
3. If you have created multiple collections with similar titles in the past, it is possible that you have confused the different collections’ secret keys with each other. **Try all secret keys with similar filenames** on your form.
4. If you remember sending an email to share your secret key with collaborators, **search the Sent folder in your email for the keyword ‘secret key’** and your collection title.
5. If you are still unable to find your secret key, you will not be able to access your existing collection data.
## My agency is migrating email domains, what should I do?
As collections are tied to email addresses, this means that you will lose access to all collections if a proper transition period is not in place. Please set a transition period where each admin have to transfer all active collections to their new email addresses.
You may follow the instructions below to add collaborators:
## I can't find an answer to my question. Where can I get further assistance?
Please contact our team through this form: