@* See Bootstrap's collapse control: https://getbootstrap.com/docs/4.4/components/collapse/ *@
@* Add type="hidden" to the original input for PosterSmall to make invisible *@
@* Change the <span asp-validation-for attribute from PosterSmall to PosterSmallFile *@

<label asp-for="..." class="control-label"></label>

Current <label asp-for="PosterSmall" class="control-label"></label>: <span>@Model.PosterSmall</span> ( <a href="#collapsePosterSmall" data-toggle="collapse" role="button" aria-expanded="false" aria-controls="collapsePosterSmall">Click to view</a>)
<div class="collapse" id="collapsePosterSmall">
    <img src="@Url.Content($"~/images/filmposters/{...}")" class="img-fluid" alt="@Html.DisplayFor(model => model.Title) Poster" />
</div>

<input asp-for="..." class="form-control" type="..." />