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Bootstrap class: .form-control-file

<input type="file" class="form-control-file" id="exampleFormControlFile1">

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Sass source

/* _forms.scss:71 */
.form-control-file {
  .was-validated &:#{$state},
  &.is-#{$state} {
    ~ .#{$state}-feedback,
    ~ .#{$state}-tooltip {
      display: block;
    }
  }
}

Uses variables

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/* _forms.scss:71 */
$state}
$state}
$state}-feedback
$state}-tooltip

More in Bootstrap Forms

Bootstrap 4 & 5