we are using Form.io form service which is free. We've created own extension which allow to handle forms and submissions. Thanks to this you can have endpoint for your forms which are stored externally, for example on your website and all submissions are going to your EspoCRM. Based on submission you can also trigger some actions with formula or advanced pack.
Here you have an example of form Company registration which have a lot of fields and after you submit, submission goes directly to EspoCRM, which handle data automatically. Extension also supports attachments, so any uploaded files are going straight to EspoCRM
Below you can check details of submission.1 - original form
2 - uploaded attachments
3 - details of submission

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