Storing a Token
The best way to store a token for later use is to generate it using the Preparse (opens new window) field. This gives you the ability to generate a single, specific token for an asset, and use it repeatedly on your site.
When creating a Preparse field, use something like this in the field configuration:
{%- apply spaceless -%}
{% set myAsset = entry.myAsset.one() %}
{% if myAsset %}
{# Existing token, or generate new token #}
{{ entry.myToken ?: craft.digitalDownload.createToken(myAsset) }}
{% endif %}
{%- endapply -%}
For the purpose of the example above:
myAsset
is an Assets field on the entry.myToken
is the self-referential handle for this Preparse field.
Replacing the Asset file
If you replace the file stored in your asset field, make sure to save it with the asset field empty first. This will clear the download token, so that it will generate a fresh one with a different asset file.