There must be something wrong with the implementation.
if you record ID is being carry forwarded in a correct way then the form will populate.

Please share how you have configured your forms/subforms

Hello, thanks for the reply. Your reply really helpful becausee apperantly i need to tick right the Auto Populate Saved Value? the advance option at the custom html form. Now i have another problem, when i submit this form which include custom html-
<div class="form-section">
  <label for="name">Name</label>
  <input type="text" id="name" name="name" class="form-control" placeholder="Enter your name" />

<label for="description">Description</label>
  <textarea id="description" name="description" class="form-control" placeholder="Enter description" rows="4"></textarea>
<label for="date">Date</label>
  <input type="date" id="date" name="date" class="form-control" />
</div>

in the approval form, at the inbox, the only data retrieve from the List is id description.

After that i try to experiment which i create 3 custom html with id name, description and date. After doing that i try to submit the form, but at the approval form in inbox, nothing of the data retrieve. Please guide me. Thank youu