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When adding custom form fields you should use meta data. To use meta data, make sure the 'name' attribute of the form field has to be 'meta[varname]'. And to access the variable in a use the variable {$$media_metadata.user.varname}
Forms

Registration

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Introduction

When adding custom form fields you should use meta data. To use meta data, make sure the 'name' attribute of the form field has to be 'meta[varname]'. And to access the variable in a <fm:MediaList> use the variable {$$media_metadata.user.varname}

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Upload

Adding custom meta data to the upload form

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