.device-filter-btn-file-upload {
    background-color: #f1f3f5 !important;
    color: #212529 !important;      /* серый текст как в Bootstrap muted */
    border: none !important;
    box-shadow: none !important;

    font-size: 14px;
    padding: 8px 12px;
    border-radius: 4px;             /* слегка закруглено */

    transition: none !important;
    text-transform: none !important;
}

/* УБИРАЕМ ВСЕ СОСТОЯНИЯ Bootstrap */
.device-filter-btn-file-upload:hover,
.device-filter-btn-file-upload:focus,
.device-filter-btn-file-upload:active,
.device-filter-btn-file-upload:focus-visible {
    background-color: #f1f3f5 !important;
    color: #212529 !important;
    border: none !important;
    box-shadow: none !important;
    outline: none !important;
}