Many organisations and clubs require certificates or qualifications such as first aid certificates, birth certificates, working with children certificates, scuba diving certificates etc.
You can create a Custom Field file which will allow you to upload a .jpg file and then view it again in the contacts profile.
Go to Organisation Settings > Custom fields > Add Custom Field
The uploaded file is available via the Contact's details:
Note: If you require a number of certificates/files per person, you need to add a field for each.